Add license header to Rakefile (Wopen3, b979144)Created 7/25/2007, updated 3/5/2024snippetsAdd missing GPL v3 license header to Rakefile. Signed-off-by: Greg Hurrell <greg@hurrell.net> ← Whitespace cleanup (WOTest, b788b43)Initial import (Wopen3, 48600ed) →All snippets