Parse dir

[jessepisel]

updated parse_directory so that capitalization in the file extension does not matter.

The parse_directory method was having issues with capitalization in the LAS file extensions. I changed the requirement from .las as a string to a tuple of (".LAS", ".las"). This appears to fix this issue at this time. All local tests are passing
Fixes #60

Reminders

• Run black . to make sure the code follows the style guide.
• Add tests for new features or tests that would have caught the bug that you're fixing.
• If adding new functionality, add an example to the docstring, gallery, and/or tutorials.

[codecov]

Codecov Report

Merging #63 (ff77412) into master (cd94f87) will decrease coverage by 0.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #63      +/-   ##
==========================================
- Coverage   83.26%   83.18%   -0.09%     
==========================================
  Files          12       12              
  Lines        1655     1659       +4     
==========================================
+ Hits         1378     1380       +2     
- Misses        277      279       +2     

Impacted Files	Coverage Δ
alaska/keyword_tree.py	99.69% <100.00%> (ø)
alaska/tests/test_parser.py	100.00% <100.00%> (ø)
alaska/get_data_path.py	77.77% <0.00%> (-22.23%)	⬇️

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