.travis.yml in asset_symlink-0.3.0 vs .travis.yml in asset_symlink-0.3.1

@@ -1,11 +1,12 @@
 language: ruby
 rvm:
-  - 2.2.2
-  - 2.3.5
-  - 2.4.2
+  - 2.4.6
+  - 2.5.5
 install: bundle install
 gemfile:
   - gemfiles/4.2.10.gemfile
   - gemfiles/5.0.gemfile
   - gemfiles/5.1.gemfile
+  - gemfiles/5.2.gemfile
+
 script: "bundle exec rake spec"
\ No newline at end of file