Changes

README: mention the pypi package

Make it easy for users to verify that the pyosmocom project from pypi
comes from the maintainers of this repository by clicking the URL and
finding the "pip install pyosmocom" line in the README.

Change-Id: Iac6fcbc1b5f0caa4cf63de5b8effe46d731080bc

Fix lint errors: unused imports

This is the first patch in a series to address everything found with
"ruff check", so we can run it in CI (additionally to pylint) and
locally as pre-commit hook.

Change-Id: Ie71039d05e9a7cc8b65543c9475b35adcb458f7e

Fix lint errors: remove unnecessary semicolons

Change-Id: I8c8586476d12461d555a2278ef936256944c9cde

Fix lint errors: do not use bare except

src/osmocom/construct.py:90:9: E722 Do not use bare `except`
   |
88 |             ad = GsmString(GreedyBytes)
89 |             return ad._encode(obj, context, path)
90 |         except:
   |         ^^^^^^ E722
91 |             ad = Ucs2Adapter(GreedyBytes)
92 |             return ad._encode(obj, context, path)

Change-Id: Ia5fe852b6d990ad728fc3dedc7012c8fced92e13