chore: simplify Travis CI commands

Author: Sam Harrison

.travis.yml

@@ -9,17 +9,13 @@ rvm:
   - 2.5
   - 2.4
   - jruby-9.2
-before_install:
-- gem install minitest
-- gem install simplecov
-- gem install codecov
 before_script:
-  - curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64
-    > ./cc-test-reporter
+  - make install
+  - curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64 > ./cc-test-reporter
   - chmod +x ./cc-test-reporter
   - "./cc-test-reporter before-build"
 script:
-  - rake
+  - make test
 after_script:
   - "./cc-test-reporter after-build --exit-code $TRAVIS_TEST_RESULT"
 deploy:

Makefile

@@ -1,7 +1,7 @@
 .PHONY: install test
 
 install:
-	gem install minitest
+	gem install bundler:1.14.6; bundle install
 
 test:
-	rake
+	rake test