Feature: offset header row

[realratchet]

+added ability to offset header row when importing header_row_index
*fixed an issue with get_headers for text formats when only one column was available

[codecov-commenter]

Codecov Report

Merging #76 (ce04abc) into master (c020586) will increase coverage by 0.06%.
The diff coverage is 94.59%.

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@@            Coverage Diff             @@
##           master      #76      +/-   ##
==========================================
+ Coverage   89.29%   89.36%   +0.06%     
==========================================
  Files          49       49              
  Lines        6709     6731      +22     
==========================================
+ Hits         5991     6015      +24     
+ Misses        718      716       -2     

Flag	Coverage Δ
pytest	89.36% <94.59%> (+0.06%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
tablite/file_reader_utils.py	86.63% <83.33%> (+0.84%)	⬆️
tablite/import_utils.py	73.86% <91.66%> (+0.30%)	⬆️
tablite/core.py	86.58% <100.00%> (ø)
tablite/version.py	100.00% <100.00%> (ø)
tests/test_filereader_formats.py	99.08% <100.00%> (+0.05%)	⬆️

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