add a repo field

Author: mourner

package.json

@@ -19,6 +19,10 @@
     "pretest": "eslint index.js test/*.js",
     "test": "tap test/test.js"
   },
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/mapbox/concaveman.git"
+  },
   "keywords": [
     "concave",
     "hull",