Update Babylon Testnet Github URL

Author: hyunwoo

chain/babylon-testnet/param_2.json

@@ -55,7 +55,7 @@
     "about" : {
         "website" : "https://babylonchain.io/",
         "docs" : "https://docs.babylonchain.io/",
-        "github" : "https://github.com/babylonchain",
+        "github" : "https://github.com/babylonlabs-io",
         "blog" : "https://babylonchain.io/blog",
         "medium": "https://medium.com/babylonchain-io",
         "reddit" : "https://www.reddit.com/r/babylonlabs/",