Point to the official Python wrapper.

Fixes #281.

Change-Id: I6e5a499578a932c60bbdc7140872368534e79c89
Reviewed-on: https://code-review.googlesource.com/c/re2/+/57814
Reviewed-by: Paul Wankadia <[email protected]>

README

@@ -27,12 +27,14 @@ under the BSD-style license found in the LICENSE file.
 
 RE2's native language is C++.
 
+The Python wrapper is at https://github.com/google/re2/tree/abseil/python
+and on PyPI (https://pypi.org/project/google-re2/).
+
 A C wrapper is at https://github.com/marcomaggi/cre2/.
 An Erlang wrapper is at https://github.com/dukesoferl/re2/ and on Hex (hex.pm).
 An Inferno wrapper is at https://github.com/powerman/inferno-re2/.
 A Node.js wrapper is at https://github.com/uhop/node-re2/ and on NPM (npmjs.com).
 An OCaml wrapper is at https://github.com/janestreet/re2/ and on OPAM (opam.ocaml.org).
 A Perl wrapper is at https://github.com/dgl/re-engine-RE2/ and on CPAN (cpan.org).
-A Python wrapper is at https://github.com/facebook/pyre2/ and on PyPI (pypi.org).
 An R wrapper is at https://github.com/qinwf/re2r/ and on CRAN (cran.r-project.org).
 A Ruby wrapper is at https://github.com/mudge/re2/ and on RubyGems (rubygems.org).