.travis.yml in turnip-3.0.0 vs .travis.yml in turnip-3.1.0

@@ -5,23 +5,15 @@
 
 branches:
   only:
     - master
 
-matrix:
-  allow_failures:
-    - gemfile: Gemfile
-    - gemfile: gemfiles/Gemfile-rspec-3.2.x
-    - rvm: ruby-head
-
 rvm:
-  - 2.1
   - 2.2
-  - 2.3.0
-  - ruby-head
+  - 2.3.6
+  - 2.4.3
+  - 2.5.0
   - jruby-19mode
 
 gemfile:
-  - Gemfile
-  - gemfiles/Gemfile-rspec-3.2.x
-  - gemfiles/Gemfile-rspec-3.3.x
-  - gemfiles/Gemfile-rspec-3.4.x
+  - gemfiles/Gemfile-rspec-3.6.x
+  - gemfiles/Gemfile-rspec-3.7.x