example code for adding header is incorrect

[JoeStrout]

The Read Me says:

Adding a request header

[r addHeaderWithName:@"test" value:@"1234"];

...but no such method exists, as far as I can see. I think this should be:

[r setHeaderWithName:@"test" value:@"1234"];

[nst]

you're right, I fixed the documentation https://github.com/nst/STHTTPRequest/commit/fbb94d273ffea91954b5bdf0f28665ffc7051dc0