Update README and CHANGES for 0.20.1 (#1959)

Author: Guillaume Petiot

Diff for: CHANGES.md

@@ -1,12 +1,4 @@
-### unreleased
-
-#### Removed
-
-#### Deprecated
-
-#### Bug fixes
-
-#### Changes
+### 0.20.1 (2021-12-13)
 
 #### New features
 

Diff for: README.md

@@ -65,7 +65,7 @@ Moreover if you adopt OCamlFormat in one project it will not break your workflow
 The recommended way is to use a versioned default profile, such as:
 
 ```
-version=0.20.0
+version=0.20.1
 ```
 
 (or replace with the output of `ocamlformat --version`)