README.md in gds-sso-17.1.1 vs README.md in gds-sso-18.0.0

@@ -175,14 +175,8 @@
 
 ```
 bundle exec rake
 ```
 
-By default, the tests use the master of [Signon](https://github.com/alphagov/signon) for running integration tests. If you want to use a branch (or commit, or tag), you can run it like this:
-
-```
-SIGNON_COMMITISH=my_branch_name bundle exec rake
-```
-
 ## Licence
 
 [MIT License](LICENCE)