Update tested rubies

Author: byroot

.travis.yml

@@ -2,11 +2,12 @@ language: ruby
 cache: bundler
 before_install: gem update bundler
 rvm:
-  - 2.2.10
-  - 2.3.8
-  - 2.4.9
-  - 2.5.7
-  - 2.6.5
+  - '2.2'
+  - '2.3'
+  - '2.4'
+  - '2.5'
+  - '2.6'
+  - '2.7'
   - ruby-head
 gemfile:
   - gemfiles/rails_5.2.gemfile
@@ -15,17 +16,17 @@ gemfile:
 matrix:
   fast_finish: true
   exclude:
-    - rvm: 2.2.10
+    - rvm: '2.2'
       gemfile: gemfiles/rails_6_0.gemfile
-    - rvm: 2.3.8
+    - rvm: '2.3'
       gemfile: gemfiles/rails_6_0.gemfile
-    - rvm: 2.4.9
+    - rvm: '2.4'
       gemfile: gemfiles/rails_6_0.gemfile
-    - rvm: 2.2.10
+    - rvm: '2.2'
       gemfile: gemfiles/rails_edge.gemfile
-    - rvm: 2.3.8
+    - rvm: '2.3'
       gemfile: gemfiles/rails_edge.gemfile
-    - rvm: 2.4.9
+    - rvm: '2.4'
       gemfile: gemfiles/rails_edge.gemfile
   allow_failures:
     - rvm: ruby-head