Replace mime-types with mini_mime for content type lookup

`mini_mime` is a minimal mime type library that's more performant and
less memory hungry.
https://github.com/discourse/mini_mime

It has replaced `mime-types` in the `mail` gem: (which is a dependency
of `actionmailer`, and by extension, `rails`)
mikel/mail#1059

As well as `capybara`:
teamcapybara/capybara#1884

Which also means using it as a dependency of `httparty` would be able to
reuse the same dependency that should be already available in most Rails
apps, instead of pulling in an extra `mime-types` dependency.

The change in code is pretty straightforward, the same one made by the
capybara PR linked above.

Changelog.md

@@ -1,6 +1,7 @@
 ## unreleased
 
 * Fix request marshaling (https://github.com/jnunemaker/httparty/pull/767)
+* [Replace `mime-types` with `mini_mime`](https://github.com/jnunemaker/httparty/pull/769)
 
 ## 0.20.0
 

httparty.gemspec

@@ -16,7 +16,7 @@ Gem::Specification.new do |s|
   s.required_ruby_version     = '>= 2.3.0'
 
   s.add_dependency 'multi_xml', ">= 0.5.2"
-  s.add_dependency('mime-types', "~> 3.0")
+  s.add_dependency 'mini_mime', ">= 1.0.0"
 
   # If this line is removed, all hard partying will cease.
   s.post_install_message = "When you HTTParty, you must party hard!"

lib/httparty.rb

@@ -5,7 +5,7 @@
 require 'uri'
 require 'zlib'
 require 'multi_xml'
-require 'mime/types'
+require 'mini_mime'
 require 'json'
 require 'csv'
 

lib/httparty/request/body.rb

@@ -84,8 +84,8 @@ def content_body(object)
 
       def content_type(object)
         return object.content_type if object.respond_to?(:content_type)
-        mime = MIME::Types.type_for(object.path)
-        mime.empty? ? 'application/octet-stream' : mime[0].content_type
+        mime = MiniMime.lookup_by_filename(object.path)
+        mime ? mime.content_type : 'application/octet-stream'
       end
 
       def file_name(object)