Update README.md

Author: scraptechguy

README.md

@@ -12,7 +12,7 @@ There's over 7,000 sundials documented around the world. Zoom in and find them a
 
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-    <img src="https://github.com/scraptechguy/Peep/actions/workflows/ios.yml/badge.svg">
+    <img src="https://github.com/scraptechguy/Peep/actions/workflows/objective-c-xcode.yml/badge.svg">
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