Switch codeclimate reporting method

.travis.yml

@@ -4,12 +4,9 @@ env:
 language: node_js
 node_js:
   - "9"
-before_script:
-  - 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
-after_script:
-  - ./cc-test-reporter after-build --exit-code $TRAVIS_TEST_RESULT
 notifications:
   slack:
     secure: KTdW1lnaIENmRYqpS9PRQXBeaHMomBXKriUcuDa6hVhAh5IOYEaH8Uo9viRcp0JJT3mU6OB5Few9S9riHrpIPl5Nq/Ip6NzOnzbM4/6+tqo7WK3IuNsDMrYW2afrx65W3Y7ESBBcA01LEcPWywFYbyg284JRFRUUaKWxiwL+b1g=
+after_success:
+  - npm install codeclimate-test-reporter
+  - codeclimate-test-reporter < coverage/lcov.info