use older version for crypto

#19

Author: sokra

package.json

@@ -9,7 +9,7 @@
     "buffer": "^3.0.3",
     "console-browserify": "^1.1.0",
     "constants-browserify": "0.0.1",
-    "crypto-browserify": "^3.9.13",
+    "crypto-browserify": "~3.2.6",
     "domain-browser": "^1.1.1",
     "events": "^1.0.0",
     "http-browserify": "^1.3.2",