add a bit on updating Python and individual packages

Author: JostMigenda

episodes/optimisation-use-latest.md

@@ -62,6 +62,12 @@ This could cause your code to crash, or worse subtly change your results.
 
 
 <!-- todo recommended way, because Python is incredibly bad at this -->
+If you have been working with an existing Python installation, the upgrade process for Python itself depends on how you installed your current version. (E.g. via conda, official installer from python.org, package manager like Homebrew/apt/yum/…)
+
+For packages you’re using, you can update those with the same package manager you used to installed them:
+
+* via `pip`, e.g. `pip install --upgrade numpy`
+* via `conda`, e.g. `conda update <PACKAGE>`
 
 <!-- Worth also mentioning for same reason, to have requirements.txt? -->