Fix tests not running in CI

Accidentally stopped running tests after this patch:
9a5b932139

.travis.yml

@@ -1,8 +1,8 @@
 language: node_js
 node_js:
-  - "6"
+  - "8"
 before_script:
   - export DISPLAY=:99.0
   - sh -e /etc/init.d/xvfb start
 script:
-  - yarn lint
+  - yarn test

src/apis/Easing/index.js

@@ -5,7 +5,6 @@
  * This source code is licensed under the BSD-style license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @providesModule Easing
  * @flow
  */