README: update comment about libsndfile.

The soundfile package nowadays ships binaries for MacOS arm64 as well
as for GNU/Linux x86_64 - which should cover most common desktop and
cloud environments that people are using.

README.md

@@ -27,7 +27,7 @@ The distribution is hosted on PyPI at: <https://pypi.python.org/pypi/wfdb/>. The
 pip install wfdb
 ```
 
-On Linux systems, accessing _compressed_ WFDB signal files requires installing `libsndfile`, by running `sudo apt-get install libsndfile1` or `sudo yum install libsndfile`. Support for Apple M1 systems is a work in progess (see <https://github.com/bastibe/python-soundfile/issues/310> and <https://github.com/bastibe/python-soundfile/issues/325>).
+On some less-common systems, you may need to install `libsndfile` separately.  See the [soundfile installation notes](https://pypi.org/project/soundfile/) for more information.
 
 The development version is hosted at: <https://github.com/MIT-LCP/wfdb-python>. This repository also contains demo scripts and example data. To install the development version, clone or download the repository, navigate to the base directory, and run: