Fix string quotation style

Author: tshemsedinov

lib/application.js

@@ -100,7 +100,7 @@ class Application extends events.EventEmitter {
     try {
       const code = await fsp.readFile(fileName, 'utf8');
       if (!code) return null;
-      const src = "'use strict';\ncontext => " + code;
+      const src = '\'use strict\';\ncontext => ' + code;
       const options = { filename: fileName, lineOffset: -1 };
       const script = new vm.Script(src, options);
       return script.runInContext(this.sandbox, SCRIPT_OPTIONS);

lib/channel.js

@@ -20,9 +20,9 @@ const HEADERS = {
   'Access-Control-Allow-Methods': 'POST, GET, OPTIONS',
   'Access-Control-Allow-Headers': 'Content-Type',
   'Content-Security-Policy': [
-    `default-src 'self' ws:`,
-    `style-src 'self' https://fonts.googleapis.com`,
-    `font-src 'self' https://fonts.gstatic.com`,
+    'default-src \'self\' ws:',
+    'style-src \'self\' https://fonts.googleapis.com',
+    'font-src \'self\' https://fonts.gstatic.com',
   ].join('; '),
 };