Merge pull request #23 from christiannaths/master

Fixes incorrect dependency notation

Author: Michelle Tilley

package.json

@@ -29,7 +29,7 @@
     "gulp-replace": "~0.3.0"
   },
   "dependencies": {
-    "topojson": ">=1.4.6",
-    "d3": ">=3.3.13"
+    "topojson": "^1.4.6",
+    "d3": "^3.3.13"
   }
 }