Update CHANGELOG.md

CHANGELOG.md

+Version 1: August 10
+1. New homepage created
+2. Sign up and login options on the bar 
+3. Button which gives the rules and regulations of a donor introduced. 
+
+Version 2: August 13
+1. Donor registration form created
+2. Donor login form created
+3. forgotten passwoed page created
+4. Receiver form created
+5. Edit profile page for donor created
+6. Rules and regulations page created
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