feat: update puppeteer to 1.20.0

lib/docs/scrapers/puppeteer.rb

@@ -1,7 +1,7 @@
 module Docs
   class Puppeteer < Github
-    self.release = '1.19.0'
-    self.base_url = 'https://github.com/GoogleChrome/puppeteer/blob/v1.19.0/docs/api.md'
+    self.release = '1.20.0'
+    self.base_url = 'https://github.com/GoogleChrome/puppeteer/blob/v1.20.0/docs/api.md'
     self.links = {
       code: 'https://github.com/GoogleChrome/puppeteer'
     }