Match travis and Gemfile ruby version.

Author: jpsacha

.travis.yml

@@ -2,6 +2,6 @@ language: ruby
 cache: bundler
 sudo: false
 rvm:
-- 2.5.1
+- 2.6.1
 before_script: bundle install
 script: "bundle exec jekyll build"

Gemfile.lock

@@ -39,7 +39,7 @@ GEM
       jekyll (~> 3.8.5)
       rake (~> 12.3.1)
     kramdown (1.17.0)
-    liquid (4.0.1)
+    liquid (4.0.2)
     listen (3.1.5)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
@@ -76,7 +76,7 @@ DEPENDENCIES
   tzinfo-data
 
 RUBY VERSION
-   ruby 2.5.1p57
+   ruby 2.6.1p33
 
 BUNDLED WITH
    2.0.1