Specify Ruby version in Gemfile

Author: yasulab

Diff for: Gemfile

@@ -1,5 +1,7 @@
 source "https://rubygems.org"
 
+ruby '2.7.1'
+
 gem "jekyll"
 gem "minima"   # default theme for new Jekyll sites
 gem 'rake'     # Enable Rakefile to run tasks

Diff for: Gemfile.lock

@@ -74,8 +74,6 @@ GEM
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
     liquid (4.0.3)
-    liquid-c (4.0.0)
-      liquid (>= 3.0.0)
     listen (3.7.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
@@ -136,11 +134,13 @@ DEPENDENCIES
   jekyll-liquify
   jekyll-minifier
   jekyll-sitemap
-  liquid-c
   minima
   pry
   rake
   webrick
 
+RUBY VERSION
+   ruby 2.7.1p83
+
 BUNDLED WITH
    2.2.28