DOC: Remove mention of make (#49030)

The makefile was deleted in ca2d5ad

Author: akx

README.md

@@ -128,8 +128,6 @@ or for installing in [development mode](https://pip.pypa.io/en/latest/cli/pip_in
 python -m pip install -e . --no-build-isolation --no-use-pep517
 ```
 
-If you have `make`, you can also use `make develop` to run the same command.
-
 or alternatively
 
 ```sh