README: fix typo/grammar

Author: blueyed

Diff for: README.rst

@@ -11,8 +11,7 @@ the only supported platform is ``x86_64``.
 .. _`Docker image`: https://hub.docker.com/r/pypywheels/manylinux2010-pypy_x86_64
 .. _manylinux: https://github.com/pypa/manylinux
 
-At the moment of writing, this image provide the following versions of
-PyPy:
+At the moment of writing, this image provides the following versions of PyPy:
 
 - PyPy2.7 7.3.3