correct pacth to coverage report

Author: Charlie Kassel

.travis.yml

@@ -2,4 +2,4 @@ language: node_js
 node_js:
   - "7"
   - "6"
-after_script: "cat ./test/coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js"
+after_script: "cat ./test/unit/coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js"