chore: mark webview, and web-webview as optional peer-dependencies

this will avoid auto-installation of dependencies that are not required

Author: LonelyCpp

package.json

@@ -40,6 +40,14 @@
     "react-native-web-webview": ">=1.0.2",
     "react-native-webview": ">=7.0.0"
   },
+  "peerDependenciesMeta": {
+    "react-native-web-webview": {
+      "optional": true
+    },
+    "react-native-webview": {
+      "optional": true
+    }
+  },
   "devDependencies": {
     "@babel/cli": "^7.2.3",
     "@babel/core": "^7.2.2",