autodetect if wrapping is necessary

[mathause]

closes #34

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@533fa7f). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master      #48   +/-   ##
=========================================
  Coverage          ?   98.49%           
=========================================
  Files             ?       18           
  Lines             ?     1195           
  Branches          ?        0           
=========================================
  Hits              ?     1177           
  Misses            ?       18           
  Partials          ?        0

Impacted Files	Coverage Δ
regionmask/test/test_mask.py	100% <100%> (ø)
regionmask/test/test_defined_regions.py	100% <100%> (ø)
regionmask/core/utils.py	100% <100%> (ø)
regionmask/core/regions.py	92.36% <100%> (ø)
regionmask/core/mask.py	93.54% <100%> (ø)
regionmask/test/test_utils.py	100% <100%> (ø)
regionmask/test/test_Regions.py	100% <100%> (ø)

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