update ts-loader (#61)

* update ts-loader

* fix caret sign for ts-loader version specification

Author: TomoyaShibata

package.json

@@ -49,7 +49,7 @@
     "rimraf": "^2.5.4",
     "rollup": "^0.37.0",
     "rollup-plugin-replace": "^1.1.1",
-    "ts-loader": "^1.3.3",
+    "ts-loader": "^2.0.0",
     "typescript": "^2.0.6",
     "uglify-js": "^2.7.5",
     "vue": "^2.1.10",