Merge pull request #13 from 221200/patch-1

improve docs

Author: lemire

README.md

@@ -10,7 +10,7 @@ Reference: [Xor Filters: Faster and Smaller Than Bloom and Cuckoo Filters](https
 
 
 
-## Prerequisites
+## Prerequisites_fastfilter
 
 - A  C++11 compiler such as GNU G++ or LLVM Clang++
 - Make