Fix changelog / docs link

I fat-fingered this in
https://github.com/flask-debugtoolbar/flask-debugtoolbar/pull/164 so
correcting it.

Author: jeffwidman

setup.cfg

@@ -11,8 +11,8 @@ long_description_content_type = text/x-rst
 keywords = flask, debug, toolbar
 url = https://github.com/flask-debugtoolbar/flask-debugtoolbar
 project_urls =
-    Changelog = https://github.com/jeffwidman/cqlsh#changelog
-    Documentation = https://github.com/flask-debugtoolbar/flask-debugtoolbar/blob/master/CHANGES.rst
+    Changelog = https://github.com/flask-debugtoolbar/flask-debugtoolbar/blob/master/CHANGES.rst
+    Documentation = https://flask-debugtoolbar.readthedocs.io/
 classifiers =
     Development Status :: 4 - Beta
     Environment :: Web Environment