Rails 5 runs on Ruby >= 2.2.2 - added this dependency to the Gemfile …

…and to the Travis build matrix. Added more Ruby and Rails versions for testing.

.travis.yml

@@ -8,6 +8,10 @@ rvm:
 - 2.0.0
 - 2.1.0
 - 2.2.0
+- 2.2.2
+- 2.2.3
+- 2.2.4
+- 2.2.5
 - 2.3.0
 - 2.3.1
 env:
@@ -17,6 +21,7 @@ env:
 - rails=4.2.0 grape=0.11.0 doorkeeper=3.1.0
 - rails=4.2.0 grape=0.13.0 doorkeeper=3.1.0
 - rails=4.2.0 grape=0.14.0 doorkeeper=3.1.0
+- rails=4.2.6 grape=0.16.2 doorkeeper=3.1.0
 - rails=5.0.0 grape=0.16.2 doorkeeper=4.0.0
 addons:
   code_climate:
@@ -25,3 +30,11 @@ notifications:
   hipchat:
     rooms:
       secure: SUWenlDzlDbpryO1QzD+rN4MxIBpAAzwsFqnnkyRQ11thRVdvKuT2TUd+RlYImLXDNkvNjqmpXh7mihtcro9g8unR3nF1UKbuAPIv2kCklsio0jAnjVn7+h1l56hsa90Jy9t/YpKtoLx2QNWLz70n8VrtGJMAt53T6tZdgNUp58=
+matrix:
+  exclude:
+    - rvm: 2.0.0
+      env: rails=5.0.0 grape=0.16.2 doorkeeper=4.0.0
+    - rvm: 2.1.0
+      env: rails=5.0.0 grape=0.16.2 doorkeeper=4.0.0
+    - rvm: 2.2.0
+      env: rails=5.0.0 grape=0.16.2 doorkeeper=4.0.0

Gemfile

@@ -4,6 +4,8 @@ ENV['grape'] ||= '0.16.2'
 ENV['rails'] ||= '5.0.0'
 ENV['doorkeeper'] ||= '4.0.0'
 
+ruby '>=2.2.2' if ENV['rails'][0].to_i > 4
+
 gem 'rails', ENV['rails']
 
 gem 'activerecord'