Use two spaces in package.json (#162)

package.json

@@ -2,14 +2,16 @@
   "name": "pa11y-dashboard",
   "version": "2.1.1",
   "private": true,
-
   "description": "Pa11y Dashboard is a visual web interface to the Pa11y accessibility reporter",
-	"keywords": [ "accessibility", "analysis", "report" ],
+  "keywords": [
+    "accessibility",
+    "analysis",
+    "report"
+  ],
   "contributors": [
     "Perry Harlock (http://www.phwebs.co.uk/)",
     "Rowan Manning (http://rowanmanning.com/)"
   ],
-
   "repository": {
     "type": "git",
     "url": "https://github.com/pa11y/dashboard.git"
@@ -17,7 +19,6 @@
   "homepage": "https://github.com/pa11y/dashboard",
   "bugs": "https://github.com/pa11y/dashboard/issues",
   "license": "GPL-3.0",
-
   "engines": {
     "node": ">=4"
   },
@@ -44,7 +45,6 @@
     "request": "^2.74",
     "uglify-js": "~2.6"
   },
-
   "scripts": {
     "start": "node index.js",
     "test": "make ci"