fix(core): update

ts/smartssr.classes.smartssr.ts

@@ -55,7 +55,7 @@ export class SmartSSR {
       if (this.options.debug) {
         screenshotBuffer = await page.screenshot({
           encoding: 'binary',
-        });
+        }) as Buffer;
       }
 
       await page.$eval('body', serializeFunction);