changed `isDevelopment` to an electron version

src/Util.js

@@ -1,6 +1,13 @@
+const electron = require("electron");
+
 const isDevelopment = () => {
-	const mode = process.env.NODE_ENV || "development";
-	return mode === "development";
+	if (typeof electron === "string")
+		return true;
+
+	const isEnvSet   = "ELECTRON_IS_DEV" in process.env;
+	const getFromEnv = parseInt(process.env.ELECTRON_IS_DEV, 10) === 1;
+
+	return isEnvSet ? getFromEnv : !electron.app.isPackaged;
 };
 
 module.exports = {