rebar: add license

see issue #43716

+1
+1
pkgs/development/tools/build-managers/rebar/default.nix
··· 36 37 platforms = stdenv.lib.platforms.unix; 38 maintainers = [ stdenv.lib.maintainers.the-kenny ]; 39 }; 40 }
··· 36 37 platforms = stdenv.lib.platforms.unix; 38 maintainers = [ stdenv.lib.maintainers.the-kenny ]; 39 + license = stdenv.lib.licenses.asl20; 40 }; 41 }