Remove source map url in Uglify options of the package.json [closes jashkenas#2145]

Author: jdalton

package.json

@@ -34,7 +34,7 @@
     "lint": "eslint --reset underscore.js test/*.js",
     "test-node": "qunit-cli test/*.js",
     "test-browser": "npm i karma-phantomjs-launcher && ./node_modules/karma/bin/karma start",
-    "build": "uglifyjs underscore.js -c \"evaluate=false\" --comments \"/    .*/\" -m --source-map underscore-min.map -o underscore-min.js",
+    "build": "uglifyjs underscore.js -c \"evaluate=false\" --comments \"/    .*/\" -m --source-map underscore-min.map --source-map-url \" \" -o underscore-min.js",
     "doc": "docco underscore.js"
   },
   "license": "MIT",