Added gitignore and npmignore in order to remove '.git/' from NPM

Author: Voltra

package.json

@@ -1,15 +1,14 @@
 {
   "name": "@voltra/json",
-  "version": "1.0.3",
+  "version": "1.0.4",
   "description": "a JavaScript HTTP client specialized for JSON communications, based upon the Fetch API",
   "main": "dist/jsonclient.js",
   "scripts": {
     "setup": "npm i && npm update",
     "build": "npm run buildTsc && npm run buildBabel && npm run webpack",
     "buildTsc": "./node_modules/.bin/tsc",
     "buildBabel": "./node_modules/.bin/babel build-tsc --out-dir build-babel --source-maps",
-    "webpack": "./node_modules/.bin/webpack --progress",
-    "prepublish": "npm run build"
+    "webpack": "./node_modules/.bin/webpack --progress"
   },
   "repository": {
     "type": "git",