Fix coveralls

[coveralls]

Pull Request Test Coverage Report for Build 8132937668

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 6 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+25.8%) to 99.828%

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Files with Coverage Reduction	New Missed Lines	%
emg3d/utils.py	2	97.44%
emg3d/cli/main.py	4	91.3%
<!--	Total:	6		-->

Totals
Change from base Build 8046835850:	25.8%
Covered Lines:	4638
Relevant Lines:	4646

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💛 - Coveralls