.travis.yml in audited-4.5.0 vs .travis.yml in audited-4.6.0

@@ -1,12 +1,12 @@
 language: ruby
 cache: bundler
 rvm:
   - 2.1
-  - 2.2.4
-  - 2.3.1
-  - 2.4.1
+  - 2.2.8
+  - 2.3.5
+  - 2.4.2
   - ruby-head
 env:
   - DB=SQLITE
   - DB=POSTGRES
   - DB=MYSQL
@@ -16,20 +16,27 @@
   - gemfiles/rails40.gemfile
   - gemfiles/rails41.gemfile
   - gemfiles/rails42.gemfile
   - gemfiles/rails50.gemfile
   - gemfiles/rails51.gemfile
+  - gemfiles/rails52.gemfile
 matrix:
   allow_failures:
     - rvm: ruby-head
   exclude:
     - rvm: 2.1
       gemfile: gemfiles/rails50.gemfile
     - rvm: 2.1
       gemfile: gemfiles/rails51.gemfile
-    - rvm: 2.4.1
+    - rvm: 2.1
+      gemfile: gemfiles/rails52.gemfile
+    - rvm: 2.4.2
       gemfile: gemfiles/rails40.gemfile
-    - rvm: 2.4.1
+    - rvm: 2.4.2
+      gemfile: gemfiles/rails41.gemfile
+    - rvm: ruby-head
+      gemfile: gemfiles/rails40.gemfile
+    - rvm: ruby-head
       gemfile: gemfiles/rails41.gemfile
   fast_finish: true
 branches:
   only:
   - master