[pitivi] Update Gst dependency to Gst 1.6

[Thibault Saunier <tsaunier src gnome org>]

commit 22fa71247239754abfc696fce64aa89d39c100e2
Author: Thibault Saunier <tsaunier gnome org>
Date:   Sat Oct 31 10:08:44 2015 +0100

    Update Gst dependency to Gst 1.6

 pitivi/check.py |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/pitivi/check.py b/pitivi/check.py
index d4510f5..e386b16 100644
--- a/pitivi/check.py
+++ b/pitivi/check.py
@@ -375,12 +375,12 @@ GTK_API_VERSION = "3.0"
 GLIB_API_VERSION = "2.0"
 HARD_DEPENDENCIES = [GICheck("3.14.0"),
                      CairoDependency("1.10.0"),
-                     GstDependency("Gst", GST_API_VERSION, "1.4.0"),
-                     GstDependency("GES", GST_API_VERSION, "1.5.0.0"),
+                     GstDependency("Gst", GST_API_VERSION, "1.6.0"),
+                     GstDependency("GES", GST_API_VERSION, "1.6.0.0"),
                      GtkDependency("Gtk", GTK_API_VERSION, "3.10.0"),
                      ClassicDependency("numpy"),
                      GIDependency("Gio", "2.0"),
-                     GstPluginDependency("opengl", "1.4.0"),
+                     GstPluginDependency("gstgtk", "1.6.0"),
                      ClassicDependency("matplotlib"),
                      ]