Don't check our own readthedocs links

Author: nedbat

doc/conf.py

@@ -227,6 +227,9 @@
     # We have lots of links to GitHub, and they start refusing to serve them to linkcheck,
     # so don't bother checking them.
     r"https://github.com/nedbat/coveragepy/(issues|pull)/\d+",
+    # When publishing a new version, the docs will refer to the version before
+    # the docs have been published.  So don't check those links.
+    r"https://coverage.readthedocs.io/en/coverage-{}$".format(release),
 ]
 
 # When auto-doc'ing a class, only write the class' docstring into the class docs,

howto.txt

@@ -21,8 +21,6 @@
     - Don't forget the man page: doc/python-coverage.1.txt
     - Check that the docs build correctly:
         $ tox -e doc
-            there will be warnings about the readthedocs links being broken,
-            because this version's docs haven't been published yet.
     - Done with changes to source files, check them in.
         - git push
     - Generate new sample_html to get the latest, incl footer version number: