Update to reflect latest changes

README.md

@@ -2,15 +2,27 @@
 
 ## Requirements
 
-Python (2.7) needs to be installed; additionally, these packages need to be
-installed:
-* `py27-yaml`
+Python 3.4 or newer needs to be installed.
 
 `tivodecode` needs to be available on the path. [mackworth/tivodecode-ng](https://github.com/mackworth/tivodecode-ng)
 appears to be working well; the original
 [TiVo File Decoder](http://tivodecode.sourceforge.net) has trouble
 decoding some files and fails silently.
 
+## Installing
+
+Create a virtual environment and install the required packages:
+
+* `python -m venv .venv` or `virtualenv .venv`
+* `. .venv/bin/activate`
+* `pip install -r requirements.txt`
+
+## Shell Wrapper
+
+To make it easier to run tivomirror from cron, the shell wrapper
+[`tivomirror`](./tivomirror) will activate the venv and then run
+`tivomirror.py`.
+
 ## Configuration
 
 `tivomirror` reads a config file, by default `~/.tivo/config.yaml`.  The