Make collection type handling case-insensitive

[pbylicki]

Addressing changes in collection scope and type in latest version of Robot Framework

[codecov]

Codecov Report

Merging #234 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #234   +/-   ##
=======================================
  Coverage   95.90%   95.90%           
=======================================
  Files          40       40           
  Lines        1049     1049           
=======================================
  Hits         1006     1006           
  Misses         43       43           

Impacted Files	Coverage Δ
rfhub2/cli/keywords_importer.py	100.00% <100.00%> (ø)
rfhub2/version.py	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update e5a62a5...b6eb902. Read the comment docs.