nodejs 12 package.json update

.gitignore

@@ -1,3 +1,3 @@
 **/.DS_Store
 /node_modules
-/coverage
+.nyc_output/

.travis.yml

@@ -1,9 +1,9 @@
 language: node_js
 node_js:
-  - "8"
+  - "12"
 cache:
   directories:
   - node_modules
 
 script:
-  - npm run lint && npm run test && npm run coveralls
+  - npm run lint && npm run coveralls

package.json

@@ -7,14 +7,14 @@
     "test": "test"
   },
   "dependencies": {
-    "chai": "^4.1.2"
+    "chai": "^4.2.0"
   },
   "devDependencies": {
-    "coveralls": "^3.0.2",
-    "eslint": "^5.8.0",
-    "istanbul": "^0.4.5",
-    "mocha": "^5.2.0",
-    "mocha-lcov-reporter": "^1.3.0"
+    "coveralls": "^3.0.8",
+    "eslint": "^6.7.0",
+    "mocha": "^6.2.2",
+    "mocha-lcov-reporter": "^1.3.0",
+    "nyc": "^14.1.1"
   },
   "homepage": "https://github.com/poanetwork/eth-net-props#readme",
   "repository": {
@@ -24,7 +24,7 @@
   "scripts": {
     "test": "mocha",
     "lint": "./node_modules/.bin/eslint .",
-    "coveralls": "./node_modules/.bin/istanbul cover ./node_modules/mocha/bin/_mocha --report lcovonly -- -R spec && cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js && rm -rf ./coverage"
+    "coveralls": "nyc npm test && nyc report --reporter=text-lcov | coveralls"
   },
   "keywords": [
     "ethereum"