DEP: Replacing the assertRaisesRegexp which is deprecated by assertRaisesRegex

[samatix]

This deprecation will enable the upgrade to add support for python 3.7 and higher
https://docs.python.org/3/library/unittest.html

[coveralls]

Coverage increased (+0.2%) to 88.184% when pulling 9340f38 on samatix:assertregex into c825927 on quantopian:master.

[ssanderson]

@samatix it looks to me like this is failing the build in Python 2.

I think the easiest fix for that would be to conditionally define assertRaisesRegex on ZiplineTestCase with something like:

if six.PY2:
    def assertRaisesRegex(self, *args, **kwargs):
        return self.assertRaisesRegexp(*args, **kwargs)

[ssanderson]

@samatix are you still planning to come back to this? If not, I or one of the other Zipline maintainers can push this over the line.

[samatix]

@samatix are you still planning to come back to this? If not, I or one of the other Zipline maintainers can push this over the line.

Definitely @ssanderson, I'll do the amendment this evening.

[ssanderson]

LGTM. Thanks for the fixes!