Update build system

Author: felixhammerl

.npmrc

@@ -17,8 +17,8 @@
   "author": "Andris Reinman <[email protected]>",
   "scripts": {
     "build": "./scripts/build.sh",
-    "release": "./scripts/release.sh",
     "lint": "$(npm bin)/standard",
+    "preversion": "npm run build","preversion": "npm run build",
     "test": "npm run lint && npm run unit",
     "unit": "$(npm bin)/mocha './src/*-unit.js' --reporter spec --require babel-register testutils.js"
   },
@@ -32,7 +32,7 @@
     "babel-preset-es2015": "^6.24.1",
     "babel-register": "^6.26.0",
     "chai": "^4.2.0",
-    "mocha": "^6.0.0",
+    "mocha": "^6.1.4",
     "pre-commit": "^1.2.2",
     "standard": "^12.0.1"
   },