expose plugin version

package.json

@@ -23,6 +23,7 @@
     "express": "^4.14.0",
     "express-urlrewrite": "^1.2.0",
     "file-loader": "^0.9.0",
+    "json-loader": "^0.5.4",
     "karma": "^1.3.0",
     "karma-chai": "^0.1.0",
     "karma-coverage": "^1.1.1",
@@ -36,6 +37,7 @@
     "rollup": "^0.36.3",
     "rollup-plugin-buble": "^0.14.0",
     "rollup-plugin-commonjs": "^5.0.5",
+    "rollup-plugin-json": "^2.0.2",
     "rollup-plugin-node-resolve": "^2.0.0",
     "snazzy": "^5.0.0",
     "standard": "^8.5.0",