[travis] Remove remaining GIT_DEPENDENCIES

Author: olivier-stasse

.travis.yml

@@ -7,7 +7,6 @@ env:
   global:
   - secure: "SnIBG/xLIHX3CSvUbqqsX8xTVqIqQ7fFS6HWO6KZQVBsT6yugTwYHbyhNiU531JejYJ/I3ZrDhXfYH3qFZiYxnH1sifvwV+fnTtMXpPN7qPZwIymkjcmm6gJF51e0C7VOfUbvKFv0ngwj+ul21rgZSMuoEvxPK0WxtE3/ZSfn9c="
   - APT_DEPENDENCIES="doxygen doxygen-latex libboost-all-dev libeigen3-dev liblapack-dev libblas-dev gfortran python-dev python-sphinx"
-  - GIT_DEPENDENCIES="proyan/dynamic-graph proyan/dynamic-graph-python"
   - DEBSIGN_KEYID=5AE5CD75
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