Install rubygems-update < v3

Since RubyGems 3.0.0 is only installable on Ruby >= 2.3, install a prior version to maintain compatibility. See rubygems/rubygems#2534
christopherstyles · Feb 26, 2019 · 65cdcef · 65cdcef
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commit 65cdcef
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diff --git a/.travis.yml b/.travis.yml
@@ -12,8 +12,7 @@ after_script:
   - ./cc-test-reporter after-build --exit-code $TRAVIS_TEST_RESULT
 
 before_install:
-  - gem update --system
-  - gem install bundler
+  - gem install bundler -v '< 2'
 
 before_script:
   - curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64 > ./cc-test-reporter

diff --git a/Gemfile b/Gemfile
@@ -4,7 +4,7 @@ source 'https://rubygems.org'
 
 gemspec
 
-gem 'bundler', '~> 1.6'
+gem 'bundler', '>= 1.7', '<= 2.0.1'
 gem 'faker', '~> 1.6'
 gem 'pry'
 gem 'rake', '< 11.0'