docs: Run all the *.md files through grammar.ly service and update accordingly

CHANGELOG.md

@@ -198,7 +198,7 @@ All notable changes to this project will be documented in this file.
 ## [4.3.2] - 2017-5-1 ##
 ### Fixes
 - #161: Fixed problematic Sinatra dependency
-- Brings back Rails 4 compatibility (and Rack 1.x applications, in general), also removes release candidate version constraint (both broken in #160). Moreover, ensures that tests are run against two major Sinatra versions, which should protect from compatibility issues in future, somewhat. Related issue: #159.
+- Brings back Rails 4 compatibility (and Rack 1.x applications, in general), also removes release candidate version constraint (both broken in #160). Moreover, ensures that tests are run against two major Sinatra versions, which should protect from compatibility issues in the future, somewhat. Related issue: #159.
 - Thanks to [Sebastian Skałacki](https://github.com/skalee) for the pull request!
 
 ## [4.3.1] - 2017-4-12 ##
@@ -220,8 +220,8 @@ All notable changes to this project will be documented in this file.
 
 ## [4.2.0] - 2017-4-10 ##
 ### Added
-- #148: Set api_key to empty string
-- This makes creating an API key for a SendGrid subuser who does not have an API key easier. See #146 for details
+- #148: Set api_key to an empty string
+- This makes creating an API key for a SendGrid sub-user who does not have an API key easier. See #146 for details
 - Thanks to [Adam Beck](https://github.com/Gwash3189) for the pull request!
 
 ## [4.1.1] - 2017-4-6 ##

CONTRIBUTING.md

@@ -18,7 +18,7 @@ Hello! Thank you for choosing to help contribute to one of the Twilio SendGrid o
 - [Code Reviews](#code-reviews)
 
 <a name="roadmap"></a>
-We use [Milestones](https://github.com/sendgrid/sendgrid-ruby/milestones) to help define current roadmaps, please feel free to grab an issue from the current milestone. Please indicate that you have begun work on it to avoid collisions. Once a PR is made, community review, comments, suggestions and additional PRs are welcomed and encouraged.
+We use [Milestones](https://github.com/sendgrid/sendgrid-ruby/milestones) to help define current roadmaps, please feel free to grab an issue from the current milestone. Please indicate that you have begun work on it to avoid collisions. Once a PR is made, community review, comments, suggestions, and additional PRs are welcomed and encouraged.
 
 There are a few ways to contribute, which we'll enumerate below:
 
@@ -42,7 +42,7 @@ A software bug is a demonstrable issue in the code base. In order for us to diag
 Before you decide to create a new issue, please try the following:
 
 1. Check the Github issues tab if the identified issue has already been reported, if so, please add a +1 to the existing post.
-2. Update to the latest version of this code and check if issue has already been fixed
+2. Update to the latest version of this code and check if an issue has already been fixed
 3. Copy and fill in the Bug Report Template we have provided below
 
 ### Please use our Bug Report Template
@@ -176,7 +176,7 @@ Please run your code through:
 
 4. Commit your changes in logical chunks. Please adhere to these [git commit
    message guidelines](http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html)
-   or your code is unlikely be merged into the main project. Use Git's
+   or your code is unlikely to be merged into the main project. Use Git's
    [interactive rebase](https://help.github.com/articles/interactive-rebase)
    feature to tidy up your commits before making them public.
 

TROUBLESHOOTING.md

@@ -28,7 +28,7 @@ Please review [our guide](https://sendgrid.com/docs/Classroom/Send/v3_Mail_Send/
 
 [Here](https://github.com/sendgrid/sendgrid-ruby/tree/0fbf579c0f7ed1dff87adc4957c4dc5a6b257068) is the last working version with v2 support.
 
-Using rubygems:
+Using RubyGems:
 
 Add this line to your application's Gemfile:
 
@@ -73,7 +73,7 @@ end
 <a name="versioning"></a>
 ## Versioning
 
-We follow the MAJOR.MINOR.PATCH versioning scheme as described by [SemVer.org](http://semver.org). Therefore, we recommend that you always pin (or vendor) the particular version you are working with to your code and never auto-update to the latest version. Especially when there is a MAJOR point release, since that is guaranteed to be a breaking change. Changes are documented in the [CHANGELOG](CHANGELOG.md) and [releases](https://github.com/sendgrid/sendgrid-ruby/releases) section.
+We follow the MAJOR.MINOR.PATCH versioning scheme as described by [SemVer.org](http://semver.org). Therefore, we recommend that you always pin (or vendor) the particular version you are working with your code and never auto-update to the latest version. Especially when there is a MAJOR point release since that is guaranteed to be a breaking change. Changes are documented in the [CHANGELOG](CHANGELOG.md) and [releases](https://github.com/sendgrid/sendgrid-ruby/releases) section.
 
 <a name="environment"></a>
 ## Environment Variables and Your Twilio SendGrid API Key
@@ -88,7 +88,7 @@ becomes
 
 `sg = SendGrid::API.new(api_key: 'SENDGRID_API_KEY')`
 
-In the first case SENDGRID_API_KEY is in reference to the name of the environment variable, while the second case references the actual Twilio SendGrid API Key.
+In the first case, SENDGRID_API_KEY is in reference to the name of the environment variable, while the second case references the actual Twilio SendGrid API Key.
 
 <a name="package-manager"></a>
 ## Using the Package Manager
@@ -118,9 +118,9 @@ gem install sendgrid-ruby -v X.X.X
 <a name="rails-specifics"></a>
 ## Rails Specifics
 
-- Namespace collision between Rails own `Mail` class and sendgrid class `Mail`. To avoid that issues please use `SendGrid::Mail` instead.
+- Namespace collision between Rails own `Mail` class and sendgrid class `Mail`. To avoid that issues please use `SendGrid:: Mail` instead.
 
-- Possibility of a namespace collision between the sendgrid class `Email` and your own defined `Email` class. To avoid these issues, you can skip the `include SendGrid` line and use the `SendGrid::` prefix for Email. Please see this [SO answer](https://stackoverflow.com/questions/41508464/rails-model-name-conflict-with-included-gem?noredirect=1#comment70223099_41508464) for specifics.
+- The possibility of a namespace collision between the sendgrid class `Email` and your own defined `Email` class. To avoid these issues, you can skip the `include SendGrid` line and use the `SendGrid::` prefix for Email. Please see this [SO answer](https://stackoverflow.com/questions/41508464/rails-model-name-conflict-with-included-gem?noredirect=1#comment70223099_41508464) for specifics.
 
 <a name="ruby-versions"></a>
 ## Ruby Versions