Use incrementing number to generate keys

package.json

@@ -18,8 +18,7 @@
     "keycode": "^2.1.2",
     "lodash": "^4.13.1",
     "type-of": "^2.0.1",
-    "ua-parser-js": "^0.7.10",
-    "uid": "0.0.2"
+    "ua-parser-js": "^0.7.10"
   },
   "peerDependencies": {
     "react": "^0.14.0 || ^15.0.0",

src/utils/uid.js

@@ -1,6 +1,4 @@
 
-import generate from 'uid'
-
 let N = 0
 
 /**
@@ -10,7 +8,7 @@ let N = 0
  */
 
 function uid() {
-  return (N++) + generate(4)
+  return String(N++)
 }
 
 /**