Update README.md

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Author: AlexanderN

README.md

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-# C-CCDA Viewer for iOS
+# C-CDA Viewer for iOS
 
 C-CDA viewer is an iOS application for viewing C-CDAs on the iPhone or iPad developed as part of the C-CDA Rendering Tool Challenge - HL7.
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@@ -22,4 +22,4 @@ objects for the viewer to display.
 ![alt text](https://github.com/alexandern/ccdaviewer/blob/master/screenshots/screen1.png "Screenshot")
 ![alt text](https://github.com/alexandern/ccdaviewer/blob/master/screenshots/screen2.png "Screenshot")
 ![alt text](https://github.com/alexandern/ccdaviewer/blob/master/screenshots/screen3.png "Screenshot")
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