[mousetrap] Change opencv in install script to OpenCV3-beta.

[Heidi Ellis <heidiellis src gnome org>]

commit 1c19f76e0b2312958bfeda33adc22d412910ceab
Author: Tyler Redzko <tredzko hotmail com>
Date:   Mon Apr 13 15:11:28 2015 -0400

    Change opencv in install script to OpenCV3-beta.

 ...tall_dependencies_fedora21_python3_opencv3.bash |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/bin/install_dependencies_fedora21_python3_opencv3.bash 
b/bin/install_dependencies_fedora21_python3_opencv3.bash
index f090863..72276b4 100755
--- a/bin/install_dependencies_fedora21_python3_opencv3.bash
+++ b/bin/install_dependencies_fedora21_python3_opencv3.bash
@@ -29,9 +29,9 @@ sudo rpm -ivh http://copr-be.cloud.fedoraproject.org/results/mosquito/myrepo/fed
 
 #install openCV 3
 cd vendor
-git clone --branch 3.0.0-alpha --depth 1 https://github.com/Itseez/opencv.git
+git clone --branch 3.0.0-beta --depth 1 https://github.com/Itseez/opencv.git
 cd opencv
-git checkout 3.0.0-alpha
+git checkout 3.0.0-beta
 
 mkdir release
 cd release