chore: update sponsors (vuejs#2164)

Author: vue-bot

themes/vue/_config.yml

@@ -15,7 +15,7 @@ platinum_sponsors:
     img: modus.png
     name: Modus
   - url: >-
-      https://www.bitsrc.io/?utm_source=vue&utm_medium=vue&utm_campaign=vue&utm_term=vue&utm_content=vue
+      https://bit.dev/?utm_source=vue&utm_medium=vue&utm_campaign=vue&utm_term=vue&utm_content=vue
     img: bit.png
     name: Bit
   - url: 'http://tooltwist.com/'
@@ -107,6 +107,9 @@ gold_sponsors:
   - url: 'https://blokt.com/'
     img: blokt_cryptocurrency_news.png
     name: Blokt Cryptocurrency News
+  - url: 'https://www.jqwidgets.com/vue/'
+    img: jqwidgets_.png
+    name: 'jQWidgets '
 silver_sponsors:
   - url: 'https://dopamine.bg/'
     img: dopamine.png