update readme

Author: FireJuun

README.md

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 A Flutter project for the AMIA CIC Conference.
 
-<img src="https://github.com/FireJuun/symptom_tracker/raw/master/symptom_tracker_demo.gif" align="right"  width="240">
+<img src="symptom_tracker_demo.gif" align="right"  width="240">
 
 ## Getting Started