Fixed license info (v1.0.1 uploaded 2019-10-21

Also, fixed a rogue space in color boxes and added guards for generating
(maybe in the future) the .dtx/.ins files.

Author: Rmano

Makefile

@@ -2,7 +2,7 @@ ctan-plain:
 	latexmk -pv xkcdcolors-manual.tex
 	rm -rf ./xkcdcolors xkcdcolors.zip
 	mkdir -p ./xkcdcolors
-	cp README.md ./xkcdcolors
+	cp README.md lppl-*.txt ./xkcdcolors
 	cp xkcdcolors.sty xkcdcolors-manual.tex ./xkcdcolors
 	cp xkcdcolors-manual.pdf  ./xkcdcolors/
 	zip -r --from-crlf xkcdcolors.zip ./xkcdcolors/

README.md

@@ -7,3 +7,6 @@ Afterward, he processed the data and sorted the names for each color by populari
 
 He obtained a nice list of around 950 color names. It's not at all surprising that a lot of people forged `CloudyBlue`, but some color is really surprising, like for example `BabyPoopGreen` or `DullPink`...
 
+### LICENSE
+
+This package use Randall Munroe's file [rgb.txt](https://xkcd.com/color/rgb.txt) which is distributed under [CC0 1.0](https://creativecommons.org/publicdomain/zero/1.0/). You can use that license or [LPPL 1.3c](https://www.latex-project.org/lppl/lppl-1-3c/)