another name change. update version. add zsh instruction

CONTRIBUTING.rst

@@ -25,7 +25,7 @@ Developer Setup
 
 .. note::
 
-    Please try to use Python 3.9+ while developing CircUp. This is so we can
+    Please try to use Python 3.9+ while developing Circup. This is so we can
     use the
     `Black code formatter <https://black.readthedocs.io/en/stable/index.html>`_
     and so that we're supporting versions which still receive security updates.

README.rst

@@ -28,7 +28,7 @@ A tool to manage and update libraries (modules) on a CircuitPython device.
 Installation
 ------------
 
-Circup requires Python 3.5 or higher.
+Circup requires Python 3.9 or higher.
 
 In a `virtualenv <https://virtualenv.pypa.io/en/latest/>`_,
 ``pip install circup`` should do the trick. This is the simplest way to make it
@@ -263,6 +263,7 @@ For Bash, add this to ~/.bashrc::
 
 For Zsh, add this to ~/.zshrc::
 
+    autoload -U compinit; compinit
     eval "$(_CIRCUP_COMPLETE=zsh_source circup)"
 
 For Fish, add this to ~/.config/fish/completions/foo-bar.fish::