update .gitmodules

Author: marionbarker

.gitmodules

@@ -21,7 +21,7 @@
 	url = https://github.com/loopnlearn/rileylink_ios.git
 [submodule "Amplitude-iOS"]
 	path = Amplitude-iOS
-	url = https://github.com/LoopKit/Amplitude-iOS.git
+	url = https://github.com/loopnlearn/Amplitude-iOS.git
 [submodule "MKRingProgressView"]
 	path = MKRingProgressView
 	url = https://github.com/loopnlearn/MKRingProgressView.git