archive v1.2 (#2665) (#2671)

.github/pull_request_template.md

@@ -16,7 +16,6 @@
 - [ ] v1.5 (TiDB Operator 1.5 versions)
 - [ ] v1.4 (TiDB Operator 1.4 versions)
 - [ ] v1.3 (TiDB Operator 1.3 versions)
-- [ ] v1.2 (TiDB Operator 1.2 versions)
 
 ### What is the related PR or file link(s)?
 

README.md

@@ -20,10 +20,10 @@ Currently, we maintain the following versions for TiDB on Kubernetes documentati
 | Branch name | Version description |
 | :--- | :-- |
 | `master` | the latest development version |
-| `release-1.5` | the 1.5 version (latest stable) |
+| `release-1.5` | the 1.5 version |
 | `release-1.4` | the 1.4 version |
 | `release-1.3` | the 1.3 version |
-| `release-1.2` | the 1.2 version |
+| `release-1.2` | the 1.2 version (archived) |
 | `release-1.1` | the 1.1 version (archived) |
 | `release-1.0` | the 1.0 version (archived) |
 
@@ -34,4 +34,4 @@ Currently, we maintain the following versions for TiDB on Kubernetes documentati
 
 ## License
 
-All documentation starting from TiDB Operator v1.5 is available under the terms of [CC BY-SA 3.0](https://creativecommons.org/licenses/by-sa/3.0/).
+All documentation starting from TiDB Operator v1.5 is available under the terms of [CC BY-SA 3.0](https://creativecommons.org/licenses/by-sa/3.0/).