Reduce build matrix, run Danger once. (#1458)

* Reduce build matrix, run Danger once.

* Restore testing for Ruby 2.1 and 2.0, undoes #1441.

Author: dblock

.travis.yml

@@ -2,27 +2,26 @@ language: ruby
 
 sudo: false
 
-rvm:
-  - 2.3.1
-  - 2.3.0
-  - 2.2.5
-  - rbx-2
-  - ruby-head
-  - jruby-head
-
 matrix:
+  include:
+    - rvm: 2.3.1
+      gemfile: Gemfile
+      before_script:
+        - bundle exec danger
+    - rvm: 2.3.1
+      gemfile: gemfiles/rack_1.5.2.gemfile
+    - rvm: 2.3.0
+    - rvm: 2.2.5
+    - rvm: 2.1.10
+      gemfile: gemfiles/rails_4.gemfile
+    - rvm: 2.0.0
+      gemfile: gemfiles/rails_3.gemfile
+    - rvm: rbx-2
+    - rvm: ruby-head
+    - rvm: jruby-head
   allow_failures:
     - rvm: ruby-head
     - rvm: jruby-head
     - rvm: rbx-2
 
-gemfile:
-  - Gemfile
-  - gemfiles/rails_3.gemfile
-  - gemfiles/rails_4.gemfile
-  - gemfiles/rack_1.5.2.gemfile
-
 bundler_args: --without development
-
-before_script:
-  - bundle exec danger

CHANGELOG.md

@@ -3,7 +3,6 @@
 
 #### Features
 
-* [#1440](https://github.com/ruby-grape/grape/pull/1441): Supports only Ruby 2.2.2 and later - [@jlfaber](https://github.com/jlfaber).
 * [#1393](https://github.com/ruby-grape/grape/pull/1393): Middleware can be inserted before or after default Grape middleware - [@ridiculous](https://github.com/ridiculous).
 * [#1390](https://github.com/ruby-grape/grape/pull/1390): Allows inserting middleware at arbitrary points in the middleware stack - [@Rosa](https://github.com/Rosa).
 * [#1366](https://github.com/ruby-grape/grape/pull/1366): Stores `message_key` on `Grape::Exceptions::Validation` - [@mkou](https://github.com/mkou).