wal-g: fix license so not to break evaluation

Changed files
+1 -1
pkgs
tools
backup
wal-g
+1 -1
pkgs/tools/backup/wal-g/default.nix
···
goPackagePath = "github.com/wal-g/wal-g";
meta = {
homepage = https://github.com/wal-g/wal-g;
-
license = stdenv.lib.asl20;
+
license = stdenv.lib.licenses.asl20;
description = "An archival restoration tool for Postgres";
maintainers = [ stdenv.lib.maintainers.ocharles ];
};