fix(lib/canvas): dont allow user to zoom

Author: rishichawda

lib/Canvas.js

@@ -9,6 +9,7 @@ var { WebView } = require("react-native-webview");
 
 function getRenderHTML(context, render, generator) {
   return `
+    <meta name="viewport" content="initial-scale=1.0, maximum-scale=1.0">
     <style>
         *{margin:0;padding:0;overflow:hidden;}canvas{transform:translateZ(0);}
     </style>