fix links in README

README.md

@@ -51,7 +51,7 @@ just before it receives the new request.
     11935 02:23:38 read(7, 0x7ffefc539c3f, 1) = -1 EAGAIN (Resource temporarily unavailable) <0.000041>
     11935 02:23:38 semop(5013504, [{0, -1, SEM_UNDO}], 1 <unfinished ...>
 
-Judging from comments in [issue 3456](https://github.com/kennethreitz/requests/issues/3458),
+Judging from comments in [issue 3458](https://github.com/psf/requests/issues/3458),
 this may not be something that requests can reasonably fix. Possibly this is
 a weakness in the http/1.1 specification.
 
@@ -60,5 +60,5 @@ a weakness in the http/1.1 specification.
 > In practice, we like to leave that choice up to our users, who are better placed to decide what to retry than we are.
 
 See also
-* https://github.com/kennethreitz/requests/issues/2364
-* https://github.com/kennethreitz/requests/issues/3458
+* https://github.com/psf/requests/issues/2364
+* https://github.com/psf/requests/issues/3458