CHANGELOG.md in google-cloud-bigtable-2.6.3 vs CHANGELOG.md in google-cloud-bigtable-2.6.4

@@ -1,6 +1,12 @@
 # Release History
 
+### 2.6.4 / 2021-10-21
+
+#### Documentation
+
+* Add documentation for quota_project Configuration attribute
+
 ### 2.6.3 / 2021-09-21
 
 #### Documentation
 
 * Fix typo in Emulator guide links