.travis.yml in grape-swagger-0.25.2 vs .travis.yml in grape-swagger-0.25.3

@@ -1,37 +1,37 @@
 language: ruby
 
 sudo: false
+before_install:
+  - gem install bundler
 
 matrix:
   include:
-    - rvm: 2.3.1
+    - rvm: 2.3.3
       script:
         - bundle exec danger
-    - rvm: 2.3.1
+    - rvm: 2.3.3
       env: MODEL_PARSER=grape-swagger-entity
-    - rvm: 2.3.1
+    - rvm: 2.3.3
       env: MODEL_PARSER=grape-swagger-representable
-    - rvm: 2.3.1
+    - rvm: 2.3.3
       env: GRAPE_VERSION=0.14.0
-    - rvm: 2.3.1
+    - rvm: 2.3.3
       env: GRAPE_VERSION=0.15.0
-    - rvm: 2.3.1
+    - rvm: 2.3.3
       env: GRAPE_VERSION=0.16.2
-    - rvm: 2.3.1
+    - rvm: 2.3.3
       env: GRAPE_VERSION=0.17.0
-    - rvm: 2.3.1
+    - rvm: 2.3.3
       env: GRAPE_VERSION=0.18.0
-    - rvm: 2.3.1
+    - rvm: 2.3.3
       env: GRAPE_VERSION=HEAD
-    - rvm: 2.3.0
     - rvm: 2.2
-    - rvm: 2.1
     - rvm: ruby-head
-    - rvm: jruby-9.1.2.0
+    - rvm: jruby-9.1.6.0
     - rvm: jruby-head
     - rvm: rbx-2
   allow_failures:
     - rvm: ruby-head
-    - rvm: jruby-9.1.2.0
+    - rvm: jruby-9.1.6.0
     - rvm: jruby-head
     - rvm: rbx-2