travis-ci: enable river tests again, numpy package was missing

diff --git a/vagrant/install-on-centos-7.sh b/vagrant/install-on-centos-7.sh
index 7e023cbef9487012df7f32a95ab15fd2402e3ed6..52ae5d0c553addac9b42b7b28aaf9180e2b28bad 100755 (executable)
--- a/vagrant/install-on-centos-7.sh
+++ b/vagrant/install-on-centos-7.sh
@@ -28,7 +28,7 @@
 # additional packages:
 
     sudo yum install -y python-pip python-Levenshtein python-psycopg2 \
-                        php-phpunit-PHPUnit
+                        python-numpy php-phpunit-PHPUnit
     pip install --user --upgrade pip setuptools lettuce==0.2.18 six==1.9 \
                                  haversine Shapely pytidylib