fixed lint errors

Author: dipunm

src/browser.ts

@@ -37,7 +37,7 @@ const browserIDMap: { [id: string]: BrowserID } = {
 export function detectBrowser(ua: string): Browser {
   const bowserInst = Bowser.getParser(ua);
   let bid: BrowserID = "unknown";
-  let version = (bowserInst.getBrowserVersion() || '').toString();
+  let version = (bowserInst.getBrowserVersion() || "").toString();
   for (const b in browserIDMap) {
     if (bowserInst.getBrowserName().toLowerCase() === b) {
       bid = browserIDMap[b];