fix grammar

Author: fsaadatmand

README.md

@@ -4,7 +4,7 @@ These are the answers to the exercises in K&R's The C Programming Language
 (second Edition).
 
 Please note that I am still going through the book, and therefore, will upload
-the remaining answers as I complete them. Please let me know if you find a
+the remaining answers as I complete them. Please let me know if you found a
 mistake or a bug. 
 
 Cheers!