Update README.md

Author: ProgrammerGaurav

README.md

@@ -1,3 +1,3 @@
 # happy-birthday
 Happy Birthday Website made using Html, css and JavaScript
-<a href="https://programmergaurav.me/happy-birthday/?name=Gaurav" target="_blank">Click Here</a>
+<a href="https://programmergaurav.me/happy-birthday/?name=Gaurav" target="blank">Click Here</a>