.travis.yml in rubocop-thread_safety-0.3.3 vs .travis.yml in rubocop-thread_safety-0.3.4

@@ -1,20 +1,15 @@
 sudo: false
 cache: bundler
 language: ruby
 rvm:
-  - 2.0.0
+  - jruby-9.1.14.0
   - 2.1
   - 2.2
   - 2.3.0
-  - ruby-head
-  - jruby-9.0.1.0
-  - rbx-3
+  - 2.4
 
 matrix:
-  allow_failures:
-    - rvm: ruby-head
-    - rvm: rbx-3
   fast_finish: true
 
 before_install: gem install --remote bundler
 install:
   - bundle install --retry=3