travis.yml in gemika-0.6.0

- old
+ new

@@ -42,10 +42,10 @@
     - gemfile: Gemfile.5.2.pg
       rvm: 2.3.1
     - gemfile: Gemfile.5.2.sqlite3
       rvm: 2.3.1
     # Rails 6.0
-    - gemfile: Gemfile.6.0.pg
+    - gemfile: Gemfile.6.1.pg
       rvm: 2.6.4
 
 install:
   # Replace default Travis CI bundler script with a version that doesn't
   # explode when lockfile doesn't match recently bumped version