fix import

Julien LepillerThu Feb 15 23:14:14+0100 2018

91504a3

fix import

more/packages/collection.scm

2424
  #:use-module (guix git-download)
2525
  #:use-module (guix utils)
2626
  #:use-module (guix build-system gnu)
27+
  #:use-module (gnu packages compression)
2728
  #:use-module (gnu packages gd)
2829
  #:use-module (gnu packages perl)
2930
  #:use-module (gnu packages web)