support any <:Real component types

[aplavin]

Fix #58 to enable integration with other Real types from packages.

[codecov]

Codecov Report

Attention: Patch coverage is 86.66667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 90.90%. Comparing base (8e1c7e4) to head (1ea3f52).
Report is 14 commits behind head on master.

Files with missing lines	Patch %	Lines
src/types.jl	86.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #59      +/-   ##
==========================================
- Coverage   94.48%   90.90%   -3.58%     
==========================================
  Files           5        6       +1     
  Lines         145      165      +20     
==========================================
+ Hits          137      150      +13     
- Misses          8       15       +7     

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[aplavin]

Failure on windows is purely python-related.

[aplavin]

bump...