cache: bundler

rvm:
  - 2.0
  - 2.1
  - 2.2
  - 2.3.0
  - 2.4.1
  - 2.5

script: bundle exec rake

notifications:
  email: false

sudo: false

git:
  depth: 10

cache: bundler

rvm:
  - 2.2
  - 2.3.0
  - 2.4.1
  - 2.5

script: bundle exec rake

notifications:
  email: false

sudo: false

git:
  depth: 10

Remove Ruby 2.0 and 2.1 from build matrix
Remove Ruby 2.0 and 2.1 from build matrix

It seems that the Bundler project has started to aggressively drop
support for older Ruby versions, and 2.0 and 2.1 are among them. It's
difficult to continue supporting them when Bundler has dropped them, so
here we drop them too.

Both have been EOLed for some time now, so it should be okay.
