fix: change prepublish to prepare (#7)

- `prepublish` is deprecated as of npm@5

Author: jlengstorf

package.json

@@ -17,7 +17,7 @@
   ],
   "scripts": {
     "prepush": "npm test",
-    "prepublish": "npm run build",
+    "prepare": "npm run build",
     "prebuild": "del-cli ./dist",
     "build": "babel src -d dist",
     "dev": "gramps dev -d ./",
@@ -81,5 +81,5 @@
       }
     }
   },
-  "version": "1.0.0-beta.4"
+  "version": "0.0.0-development"
 }