[pkg] Move coveralls to dev dependencies

Author: lpinca

.travis.yml

@@ -16,7 +16,7 @@ matrix:
 script:
   - "npm run ${SCRIPT}"
 after_script:
-  - 'if [ "${SCRIPT}" == "test" ]; then npm i coveralls@3 && cat coverage/lcov.info | coveralls; fi'
+  - 'if [ "${SCRIPT}" == "test" ]; then nyc report --reporter=text-lcov | coveralls; fi'
 notifications:
   irc:
     channels:

package.json

@@ -39,6 +39,7 @@
   "devDependencies": {
     "assume": "^2.2.0",
     "browserify": "^16.2.3",
+    "coveralls": "^3.1.0",
     "mocha": "^8.0.1",
     "nyc": "^15.0.0",
     "pre-commit": "^1.2.2",