bump pbkdf2-compat version to accomodate a dependency fix there

Author: Christian Kaatz

package.json

@@ -15,7 +15,7 @@
     "node": "*"
   },
   "dependencies": {
-    "pbkdf2-compat": "2.0.0",
+    "pbkdf2-compat": "2.0.1",
     "ripemd160": "0.2.0",
     "sha.js": "2.2.6"
   },