.travis.yml in soulless-1.0.0 vs .travis.yml in soulless-1.1.0

@@ -1,8 +1,9 @@
 language: ruby
 rvm:
   - 2.2.2
   - 2.3.0
+  - 2.4.0
   - ruby-head
   - jruby-head
 env:
   - "ACTIVE_RECORD_VERSION=4.2.0"
   - "ACTIVE_RECORD_VERSION=~5.0.0"