.travis.yml in kt-paperclip-6.3.0 vs .travis.yml in kt-paperclip-6.4.0

@@ -4,10 +4,11 @@
   - 2.2
   - 2.3
   - 2.4
   - 2.5
   - 2.6
+  - 2.7
 
 script: "bundle exec rake clean spec cucumber"
 
 addons:
   apt:
@@ -34,5 +35,11 @@
       rvm: 2.2
     - gemfile: gemfiles/6.0.gemfile
       rvm: 2.3
     - gemfile: gemfiles/6.0.gemfile
       rvm: 2.4
+    - gemfile: gemfiles/4.2.gemfile
+      rvm: 2.7
+    - gemfile: gemfiles/5.0.gemfile
+      rvm: 2.7
+    - gemfile: gemfiles/5.1.gemfile
+      rvm: 2.7