Updated Python version requirement in installation guide (#2482)

Author: behackl

docs/source/installation.rst

@@ -36,7 +36,7 @@ in order for Manim to work properly, some additional system
 dependencies need to be installed first. The following pages have
 operating system specific instructions for you to follow.
 
-Manim is **only** compatible with Python versions `3.7–3.9`, but not `3.10` for now.
+Manim requires Python version ``3.7`` or above to run.
 
 .. hint::