Remove some comments, update README, update ssp.hpp

include/ss/extract.hpp

@@ -16,7 +16,6 @@
 #include <cstdlib>
 #endif
 
-// TODO try from_chars for integer conversions
 namespace ss {
 
 ////////////////

include/ss/parser.hpp

@@ -1,6 +1,5 @@
 #pragma once
 
-// TODO add single header tests
 #include "common.hpp"
 #include "converter.hpp"
 #include "exception.hpp"