Regenerate docs/index.md by run npm run doc

[huan]

But the diff seems very large, please make sure there have no any problems with it.

[lijiarui]

I just run npm run doc and there isn't any different between version Wechaty v0.13.50 Documentation

So I guess you run the doc in a wrong way.

[huan]

The latest version of Wechaty today is 0.13.70, not 0.13.50.

Sorry, mission canceled.

[lijiarui]

version 0.13.70 VS version 0.13.50

diff --git a/docs/index.md b/docs/index.md
index cac6b41..388f675 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -1,4 +1,5 @@
-# Wechaty v0.13.50 Documentation
+# Wechaty v0.13.72 Documentation
+* https://blog.chatie.io

 ## Classes

...skipping...
diff --git a/docs/index.md b/docs/index.md
index cac6b41..388f675 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -1,4 +1,5 @@
-# Wechaty v0.13.50 Documentation
+# Wechaty v0.13.72 Documentation
+* https://blog.chatie.io

 ## Classes