.travis.yml in grape-swagger-0.20.2 vs .travis.yml in grape-swagger-0.20.3

@@ -1,21 +1,30 @@
 language: ruby
 
 sudo: false
 
-rvm:
-  - 2.3.0
-  - 2.2.3
-  - 2.1.7
-  - jruby-19mode
-  - jruby-9.0.5.0
-  - rbx-2
-
 matrix:
+  include:
+    - rvm: 2.3.1
+      env: GRAPE_VERSION=0.12.0
+    - rvm: 2.3.1
+      env: GRAPE_VERSION=0.13.0
+    - rvm: 2.3.1
+      env: GRAPE_VERSION=0.14.0
+    - rvm: 2.3.1
+      env: GRAPE_VERSION=0.15.0
+    - rvm: 2.3.1
+      env: GRAPE_VERSION=0.16.2
+    - rvm: 2.3.1
+      env: GRAPE_VERSION=HEAD
+    - rvm: 2.3.0
+    - rvm: 2.2.5
+    - rvm: 2.1
+    - rvm: rbx-2
+    - rvm: jruby-19mode
+    - rvm: ruby-head
+    - rvm: jruby-head
   allow_failures:
     - rvm: rbx-2
     - rvm: jruby-19mode
-env:
-  - GRAPE_VERSION=0.12.0
-  - GRAPE_VERSION=0.13.0
-  - GRAPE_VERSION=0.14.0
-  # - GRAPE_VERSION=HEAD
+    - rvm: ruby-head
+    - rvm: jruby-head