Upgrade npm dependencies. (#138)

Author: jianjunz

package-lock.json

@@ -33,7 +33,7 @@
     "grunt-contrib-jshint": "^2.0.0",
     "grunt-contrib-uglify-es": "git+https://github.com/gruntjs/grunt-contrib-uglify.git#ccb95a70cad6a4e9e902d3bd5d0e38a4de09a1e1",
     "grunt-eslint": "^21.0.0",
-    "grunt-jsdoc": "^2.2.1",
+    "grunt-jsdoc": "^2.3.1",
     "grunt-string-replace": "~1.3.1",
     "ink-docstrap": "^1.3.2",
     "sinon": "^7.1.1"