Merge pull request #19 from apache/fix-trusty

python3-venv is python3.4-venv on trusty
diff --git a/bin/apt-dependencies.sh b/bin/apt-dependencies.sh
index 8af5235..66cdea3 100755
--- a/bin/apt-dependencies.sh
+++ b/bin/apt-dependencies.sh
@@ -60,7 +60,7 @@
 apt-get -y dist-upgrade
 
 # install build-time dependencies
-if [[ ${VERSION} == "trusty" ]]; then
+if [[ ${VERSION_CODENAME} == "trusty" ]]; then
   VENV=python3.4-venv
 else
   VENV=python3-venv