Bump to v3.0.0.

internal/metaMap.js

@@ -0,0 +1,10 @@
+import isNative from '../lang/isNative';
+import root from './root';
+
+/** Native method references. */
+var WeakMap = isNative(WeakMap = root.WeakMap) && WeakMap;
+
+/** Used to store function metadata. */
+var metaMap = WeakMap && new WeakMap;
+
+export default metaMap;