requirements: Use breezy versions with available binary wheels

Latest breezy versions have no available binary wheels and require a
rust compiler to be installed so ensure to use versions with precompiled
Python extensions.

requirements.txt

@@ -2,4 +2,4 @@
 # should match https://pypi.python.org/pypi names. For the full spec or
 # dependency lines, see https://pip.readthedocs.org/en/1.1/requirements.html
 
-breezy >= 3.3.1 # has wheels for most architecture
+breezy >= 3.3.1, != 3.3.6, != 3.3.7 # use versions with available binary wheels