Make the logo more visible in dark mode (#1135)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: dukecat0

CHANGELOG.md

@@ -1,5 +1,7 @@
 ## dev
 
+- [docs] Make the logo more visible in dark mode
+
 ## 1.3.2
 
 - The project version number is now dynamic and generated from the VCS at build time

README.md

@@ -1,6 +1,6 @@
 <p align="center">
 <a href="https://pipx.pypa.io">
-<img align="center" src="https://github.com/pypa/pipx/raw/main/logo.png" width="200"/>
+<img align="center" src="https://github.com/pypa/pipx/raw/main/logo.svg" width="200"/>
 </a>
 </p>