Bump version number

Author: aaugustin

docs/changelog.rst

@@ -25,11 +25,16 @@ fixing regressions shortly after a release.
 Only documented APIs are public. Undocumented APIs are considered private.
 They may change at any time.
 
-9.0
+9.1
 ...
 
 *In development*
 
+9.0
+...
+
+*May 1, 2021*
+
 .. note::
 
     **Version 9.0 moves or deprecates several APIs.**

docs/conf.py

@@ -59,9 +59,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = '8.1'
+version = '9.0'
 # The full version, including alpha/beta/rc tags.
-release = '8.1'
+release = '9.0'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.

src/websockets/version.py

@@ -1 +1 @@
-version = "8.1"
+version = "9.0"