feat: add linting to travis script

.travis.yml

@@ -10,7 +10,8 @@ cache:
 before_script:
   - truffle version
 script:
-  - npm test
+  - npm run lint
+  - npm run test
 notifications:
   slack:
     rooms:

package.json

@@ -4,6 +4,7 @@
   "description": "Secure Smart Contract library for Solidity",
   "scripts": {
     "test": "scripts/test.sh",
+    "lint": "eslint .",
     "console": "truffle console",
     "coverage": "scripts/coverage.sh"
   },