Updated main README with link to hasura module docs.

vvuwei · vvuwei · commit 8c60a02e63c1 · 2023-03-14T17:43:05.000+08:00
diff --git a/README.md b/README.md
@@ -233,4 +233,8 @@ head, err := tzkt.GetHead(ctx)
 if err != nil {
 	log.Panic(err)
 }
-```
+```
+
+### `hasura`
+
+Go wrapper for Hasura metadata methods, read docs [here](hasura/README.md)
