.travis.yml in backticks-1.0.1 vs .travis.yml in backticks-1.0.2

@@ -2,7 +2,9 @@
 language: ruby
 rvm:
 - 2.0
 - 2.1
 - 2.2
+- 2.3
+- 2.4
 before_install: gem install bundler -v '~> 1.10'
 script: bundle exec rake spec