Merge pull request #76 from big-r81/patch-1

Update README.md
diff --git a/README.md b/README.md
index ca70e64..7d66248 100644
--- a/README.md
+++ b/README.md
@@ -127,5 +127,5 @@
 
 [1]: http://mail-archives.apache.org/mod_mbox/couchdb-user/
 [2]: http://mail-archives.apache.org/mod_mbox/couchdb-dev/
-[3]: https://github.com/apache/couchdb/blob/master/CONTRIBUTING.md
+[3]: https://github.com/apache/couchdb/blob/main/CONTRIBUTING.md