Update README to reflect new pip installation command

Removed outdated pip installation instructions.

Author: arnobaer

README.md

@@ -10,9 +10,6 @@ Meta package providing Python bindings for
 It is recommended to install the utm Python bindings in a virtual environment
 which makes it also possible to run multiple versions of utm in parallel.
 
-Note that `pip` >= 19.0 is required.
-
 ```bash
-pip install --upgrade pip
-pip install git+https://github.com/cms-l1-globaltrigger/[email protected]
+pip install --index https://globaltrigger.web.cern.ch/pypi tm-python==0.13.0
 ```