fix: crypto-js crashing React Native (#1218)

Closes: #1201

Moves crypto-js to optionalDependencies

Author: dplewis

package.json

@@ -31,7 +31,6 @@
   "dependencies": {
     "@babel/runtime-corejs3": "7.11.2",
     "@babel/runtime": "7.11.2",
-    "crypto-js": "4.0.0",
     "react-native-crypto-js": "1.0.0",
     "uuid": "3.4.0",
     "ws": "7.3.1",
@@ -75,6 +74,9 @@
     "regenerator-runtime": "0.13.5",
     "vinyl-source-stream": "2.0.0"
   },
+  "optionalDependencies": {
+    "crypto-js": "4.0.0"
+  },
   "scripts": {
     "build": "node build_releases.js",
     "release": "node build_releases.js && npm publish",