Add docs/releases/2021.md

Author: superstructor

CHANGELOG.md

@@ -1,2 +1,2 @@
-The [CHANGELOG has moved here](https://day8.github.io/re-frame/releases/2020).
+The [CHANGELOG has moved here](https://day8.github.io/re-frame/releases/2021).
 

docs/api-intro.md

@@ -9,7 +9,7 @@ In the navigation to the left, you'll see a link to both.
 
 ## Dependency Information 
 
-Please review both the [releases page](http://day8.github.io/re-frame/releases/2020) and the [Clojars page](https://clojars.org/re-frame/) to discover the version you should be using. 
+Please review both the [releases page](http://day8.github.io/re-frame/releases/2021) and the [Clojars page](https://clojars.org/re-frame/) to discover the version you should be using. 
 
 
 ## Using re-frame

docs/releases/2021.md

@@ -0,0 +1,19 @@
+
+<!-- leave this H1 here. It stops mkdocs putting in a Title at the top.
+     It needs to be at the top of the file otherwise it breaks the 
+     table of contents on the right hand side. -->
+#
+
+> The re-frame [Clojars page](https://clojars.org/re-frame/) contains dependency coordinates for Maven/deps/Lein.
+
+## Unreleased
+
+## 1.2.0 (2021-02-25)
+
+> **IMPORTANT:** If using re-frame-10x you must upgrade to 1.0.0 to use re-frame with reagent 1.0.0!
+
+#### Changed
+
+- Upgrade to [reagent 1.0.0](https://github.com/reagent-project/reagent/blob/master/CHANGELOG.md#100-2020-12-21) which includes [React 17.0.1](https://reactjs.org/blog/2020/10/20/react-v17.html)
+- Upgrade clojure.tools.logging to 1.1.0
+

mkdocs.yml

@@ -6,7 +6,7 @@ site_url: https://day8.github.io/re-frame/
 repo_name: day8/re-frame
 repo_url: https://github.com/day8/re-frame
 
-copyright: Copyright © 2015-2020 Michael Thompson
+copyright: Copyright © 2015-2021 Michael Thompson
 
 theme:
   name: material
@@ -95,6 +95,7 @@ nav:
     - Builtin Effects: api-builtin-effects.md
     - re-frame.core: api-re-frame.core.md
   - Releases:
+    - 2021: releases/2021.md
     - 2020: releases/2020.md
     - 2019: releases/2019.md
     - 2018: releases/2018.md