Fix fusesoc dependency breakage using python-requirements.txt #311
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In #302, azure-pipelines.yml was modified to ensure that attrs 19.1.0 is
installed. This is because 19.2.0 breaks FuseSoC via the simplesat
dependency (see enthought/sat-solver#270).
While the edits to azure-pipelines.yml fixed CI, users following the
getting started guide are still going to run into this issue. This
commit addresses the problem in an alternative way - by specifying the
version of attrs to use in python-requirements.txt.
Introducing a constraints.txt could have advantages, but that is more
intrusive and would require further doc updates. I feel that would be
overkill for a quick fix workaround that we hope to remove quite
rapidly.
This patch intends to be a quick fix - hopefully upstream simplesat will be fixed soon, or alternatively we can depend on a forked simplesat repo that contains the fix.