Need to pin markupsafe if we restrict jinja2 version

[seibert]

See https://github.com/pallets/markupsafe/issues/284 for issue

[coveralls]

Pull Request Test Coverage Report for Build 1890854052

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.2%) to 85.868%

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Totals
Change from base Build 1889400121:	0.2%
Covered Lines:	4563
Relevant Lines:	5314

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💛 - Coveralls

[seibert]

We seem to be able to move to a newer jinja2, which removes the incompatibility with the latest markupsafe