package: update standard

package.json

@@ -30,15 +30,17 @@
     "mocha-lcov-reporter": "0.0.1",
     "mochify": "^2.10.0",
     "secure-random": "^1.0.0",
-    "standard": "4.x"
+    "standard": "6.x"
   },
   "dependencies": {
     "coinstring": "^2.0.0",
     "secp256k1": "^3.0.1"
   },
   "scripts": {
+    "lint": "standard",
     "browser-test": "mochify --wd -R spec",
     "test": "standard && mocha",
+    "unit": "mocha",
     "coverage": "./node_modules/.bin/istanbul cover ./node_modules/.bin/_mocha -- --reporter list test/*.js",
     "coveralls": "npm run-script coverage && node ./node_modules/.bin/coveralls < coverage/lcov.info"
   }