Update Gemfile

# Change Gemfile source to https://rubygems.org to stop warning.
 
# The source :rubygems is deprecated because HTTP requests are insecure.
# Please change your source to 'https://rubygems.org' if possible, or
# 'http://rubygems.org' if not.
Merge pull request #46 from hikari-boulders/patch-1

Update Gemfile