Expand supported Ruby versions to include 2.6

.travis.yml

@@ -2,6 +2,7 @@ language: ruby
 rvm:
   - 2.4.5
   - 2.5.3
+  - 2.6.0
 cache:
   - bundler
 before_install:

CONTRIBUTING.md

@@ -8,7 +8,7 @@ There are a couple ways you can help improve svgeez:
 
 ## Getting Started
 
-svgeez is developed using Ruby 2.4.5 and is additionally tested against Ruby 2.5.3 using [Travis CI](https://travis-ci.org/jgarber623/svgeez).
+svgeez is developed using Ruby 2.4.5 and is additionally tested against Ruby 2.5.3 and 2.6.0 using [Travis CI](https://travis-ci.org/jgarber623/svgeez).
 
 Before making changes to svgeez, you'll want to install Ruby 2.4.5. It's recommended that you use a Ruby version managment tool like [rbenv](https://github.com/rbenv/rbenv), [chruby](https://github.com/postmodern/chruby), or [rvm](https://github.com/rvm/rvm). Once you've installed Ruby 2.4.5 using your method of choice, install the project's gems by running:
 

README.md

@@ -21,7 +21,7 @@ _For more on why SVG sprites are the bee's knees as far as icon systems go, give
 
 ## Getting Started
 
-Before installing and using svgeez, you'll want to have Ruby 2.4 (or newer) installed on your computer. There are plenty of ways to go about this, but my preference is [rbenv](https://github.com/sstephenson/rbenv). svgeez is developed using Ruby 2.4.5 and automatically tested against 2.4.5 and 2.5.3 by [Travis CI](https://travis-ci.org/jgarber623/svgeez).
+Before installing and using svgeez, you'll want to have Ruby 2.4 (or newer) installed on your computer. There are plenty of ways to go about this, but my preference is [rbenv](https://github.com/sstephenson/rbenv). svgeez is developed using Ruby 2.4.5 and is additionally tested against Ruby 2.5.3 and 2.6.0 using [Travis CI](https://travis-ci.org/jgarber623/svgeez).
 
 ## Installation
 

svgeez.gemspec

@@ -4,7 +4,7 @@ $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 require 'svgeez/version'
 
 Gem::Specification.new do |spec|
-  spec.required_ruby_version = ['>= 2.4', '< 2.6']
+  spec.required_ruby_version = ['>= 2.4', '< 2.7']
 
   spec.name          = 'svgeez'
   spec.version       = Svgeez::VERSION