fix(linux): fix closing on linux

src/background/background.js

@@ -318,3 +318,19 @@ app.on('before-quit', () => {
 	if (sphinx)
 		stop()
 })
+
+var rl = require("readline").createInterface({
+	input: process.stdin,
+	output: process.stdout
+});
+
+rl.on("SIGINT", function () {
+	process.emit("SIGINT");
+});
+
+process.on("SIGINT", () => {
+	if (sphinx)
+		stop()
+	else 
+		app.quit()
+});