Trivial: update url to new url

Change-Id: Ibaf89ec28e9dd9fd9a252034e1a2a3f6db04c364

specs/kilo/semver-support.rst

@@ -277,6 +277,6 @@ References
 ==========
 
 [1] http://semver.org
-[2] https://pypi.python.org/pypi/semantic_version/
+[2] https://pypi.org/project/semantic_version/
 [3] https://review.openstack.org/#/c/151466/
 [4] https://www.python.org/dev/peps/pep-0440/

specs/kilo/taskflow-integration.rst

@@ -142,7 +142,7 @@ References
 
 * https://github.com/openstack/taskflow
 
-* https://pypi.python.org/pypi/taskflow/
+* https://pypi.org/project/taskflow/
 
 * https://review.openstack.org/#/c/85211/14 (needs to be rebased once the spec
   is approved)