Fix capitalization

Author: vinta

README.md

@@ -4,7 +4,7 @@ An opinionated list of Python frameworks, libraries, tools, and resources.
 
 # **Sponsors**
 
-- **[pyr](https://pyrun.dev)**: zero-config Python project manager. Bootstraps its own runtime, app-convention, and working imports - out the box.
+- **[pyr](https://pyrun.dev)**: Zero-config Python project manager. Bootstraps its own runtime, app-convention, and working imports - out the box.
 
 > The **#10 most-starred repo on GitHub**. Put your product in front of Python developers. [Become a sponsor](SPONSORSHIP.md).