Remove Regex namespace reference

Summary:
There's currently no Regex methods
Closes #43

Differential Revision: D6666371

fbshipit-source-id: 2785be708ad64565a624cf082ed6cf24948dcb93

README.md

@@ -14,7 +14,7 @@ This library is especially useful for working with the Hack arrays (`vec`,
 ```Hack
 <?hh // strict
 
-use namespace HH\Lib\{Vec,Dict,Keyset,Str,Regex,Math};
+use namespace HH\Lib\{Vec,Dict,Keyset,Str,Math};
 
 function main(vec<?int> $foo): vec<string> {
   return $foo