Fix Electron 5 compatibility (#10)

Author: dedo1911

index.js

@@ -18,7 +18,7 @@ const getPath = async pth => {
 		if (result.isDirectory()) {
 			return getPath(path.join(pth, 'index.html'));
 		}
-	} catch (err) {}
+	} catch (error) {}
 };
 
 module.exports = options => {
@@ -42,7 +42,15 @@ module.exports = options => {
 		});
 	};
 
-	electron.protocol.registerStandardSchemes([options.scheme], {secure: true});
+	if (electron.protocol.registerStandardSchemes) {
+		// Electron <= 4.x
+		electron.protocol.registerStandardSchemes([options.scheme], {secure: true});
+	} else {
+		// Electron >= 5.x
+		electron.protocol.registerSchemesAsPrivileged([
+			{scheme: options.scheme, privileges: {secure: true, standard: true}}
+		]);
+	}
 
 	electron.app.on('ready', () => {
 		const session = options.partition ?