Capitalization handling

[jlecomte]

Hi!

I would like to suggest a very minor enhancement. Consider this when you get a chance :)

I noticed that zlib (all lowercase) did not match any SPDX license id, but Zlib (capitalized) does. However, per section 4.1.1 of the SPDX License List Matching Guidelines, all letters should be considered as lower case letters (I hope I am reading this section correctly)

Related issue: marcello3d/node-char-split#3

Thank you, and thanks for this most helpful package :)

[jlecomte]

Maybe this should be an issue on the spdx package instead?