readme: remove changelog reference

Author: nalgeon

Makefile

@@ -1,5 +1,5 @@
 .DEFAULT_GOAL := all
-.PHONY: all changelog coverage deps lint publish pull push schemas test
+.PHONY: all coverage deps lint publish pull push schemas test timing
 
 all:  ## Run tests with coverage, lint and static-check code
 	make coverage

README.md

@@ -130,10 +130,6 @@ Be sure to add or update tests as appropriate.
 
 Use [Black](https://black.readthedocs.io/en/stable/) for code formatting.
 
-## Release notes
-
-See [CHANGELOG.md](CHANGELOG.md)
-
 ## License
 
 [MIT](https://choosealicense.com/licenses/mit/)