hardcode decimal fractions

[nikolaydubina]

closes #26

[codecov]

Codecov Report

Attention: Patch coverage is 96.77419% with 2 lines in your changes missing coverage. Please review.

Project coverage is 98.96%. Comparing base (878c2f4) to head (2f9c004).
Report is 1 commits behind head on master.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
fp3/fpdecimal.go	90.00%	1 Missing ⚠️
fp6/fpdecimal.go	98.07%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##            master      #27      +/-   ##
===========================================
- Coverage   100.00%   98.96%   -1.04%     
===========================================
  Files            3        4       +1     
  Lines          141      193      +52     
===========================================
+ Hits           141      191      +50     
- Misses           0        2       +2     

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