fixes spelling of minimum in readme (seanprashad#158)

Author: ddisqq

README.md

@@ -96,7 +96,7 @@ If must solve in-place then
     - Swap corresponding values
     - Store one or more different values in the same pointer
 
-If asked for maximum/minumum subarray/subset/options then
+If asked for maximum/minimum subarray/subset/options then
     - Dynamic programming
 
 If asked for top/least K items then