deps: upgrade loader-koa (#30)

Author: JacksonTian

package.json

@@ -15,7 +15,7 @@
     "egg-scripts": "^2.5.0",
     "egg-view-ejs": "^2.0.0",
     "loader": "^2.1.1",
-    "loader-koa": "^2.0.0",
+    "loader-koa": "^2.0.1",
     "lodash": "^4.17.5",
     "markdown-it": "^8.4.1",
     "uuid": "^3.2.1",