message: update libtorrent revision in .travis.yml
diff: @@ -44,7 +44,7 @@ before_install:
  # libtorrent: download and checkout revision
  - git clone https://github.com/aldenml/libtorrent
  - cd libtorrent
  - - git checkout 4e4abfc49b594c3ea4d08203cf300e7300f649c1
  + - git checkout d138f0242453bf36d7e5744c35f4452c4dce4467
  - cd ..
  - export LIBTORRENT_ROOT=$PWD/libtorrent
  