CHANGELOG.md in google-cloud-bigquery-1.21.1 vs CHANGELOG.md in google-cloud-bigquery-1.21.2

@@ -1,6 +1,12 @@
 # Release History
 
+### 1.21.2 / 2020-07-21
+
+#### Documentation
+
+* Update Data#each samples
+
 ### 1.21.1 / 2020-05-28
 
 #### Documentation
 
 * Fix a few broken links