Remove es5 name from main in package.json definition

Author: Anthropic

package.json

@@ -52,7 +52,7 @@
     "gulp-rename": "^1.2.0",
     "gulp-uglify": "^0.2.1",
     "gulp-umd": "^0.1.3",
-    "json-schema-form-core": "git+https://github.com/json-schema-form/json-schema-form-core.git#develop",
+    "json-schema-form-core": "git://github.com/json-schema-form/json-schema-form-core.git#develop",
     "karma": "^0.13.22",
     "karma-chai-sinon": "^0.1.5",
     "karma-coverage": "^1.0.0",