tweak readme

Author: robtaylor

README.rst

@@ -86,7 +86,7 @@ Install the build dependencies:
 
 .. code-block:: bash
 
-   sudo apt install python3 python3-pip python3.10-venv \
+   sudo apt install python3 python3-pip python3-venv \
                     doxygen pelican texlive-latex-recommended \
                     bison flex \
                     qtbase5-dev libqt5svg5-dev libqwt-qt5-dev libbz2-dev \
@@ -162,7 +162,8 @@ First we set up our pdm virtual environment:
 
 .. code-block:: bash
 
-   pdm install --no-self -d --plugins
+   pdm plugin update
+   pdm sync -d --no-self
    
 Below we are just using a local directory call builddir for our _meson build directory, but you can put it wherever you like.