Try fixing travis (#8085)

.travis.yml

@@ -19,7 +19,7 @@ cache:
 
 git:
     depth: false
-  
+
 env:
   global:
     - CI=true
@@ -32,20 +32,24 @@ before_install:
   - sudo unzip chromedriver_linux64.zip -d /usr/local/bin/
   - sudo chmod +x /usr/local/bin/chromedriver
   - google-chrome-stable --headless --disable-gpu --remote-debugging-port=9222 http://localhost &
+  - yes | gem update --system --force
+  - gem install bundler
 
 install:
   - rm -rf test/reports
   - cp config/database.yml.example config/database.yml
   - cp db/schema.rb.example db/schema.rb
   - bundle config set path 'vendor/.bundle/'
+  - rm -rf vendor/.bundle/
   - bundle install
+  - gem list
   - if [ $RAILS_ENV != 'production' ]; then
       yarn check || yarn install;
     fi
   - mysql -e "CREATE DATABASE plots;";
   - bundle exec rake db:schema:load
   - bundle exec rake db:migrate
-  - if [ "$TRAVIS_PULL_REQUEST" == "true" ]; then 
+  - if [ "$TRAVIS_PULL_REQUEST" == "true" ]; then
       gem install danger danger-junit google-cloud-storage;
     fi
   - echo "$GOOGLE_APPLICATION_CREDENTIALS_JSON" > /tmp/credentials.json # needs to be a path to a json file, so we shuffle...
@@ -60,7 +64,7 @@ jobs:
       script: bundle exec rails test test/integration
     - name: "System Tests"
       script: bundle exec rails test:system
-    
+
 after_script:
   - echo -e '<?xml version="1.0" encoding="UTF-8"?>' > output.xml;
   - tail -n +2 -q ./test/reports/TEST*.xml >> output.xml

Gemfile.lock

@@ -693,4 +693,4 @@ RUBY VERSION
    ruby 2.4.4p296
 
 BUNDLED WITH
-   1.17.3
+   2.1.4