update requirements-dev to use v13 branch of common

Change-Id: I14db774489c4e69eaa40360a00e0b6bdada72e1b
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/requirements-dev.in b/requirements-dev.in
index 7deae87..48cac60 100644
--- a/requirements-dev.in
+++ b/requirements-dev.in
@@ -12,5 +12,5 @@
 #     See the License for the specific language governing permissions and
 #     limitations under the License.
 
-git+https://osm.etsi.org/gerrit/osm/common.git@master#egg=osm-common
+git+https://osm.etsi.org/gerrit/osm/common.git@v13.0#egg=osm-common
 -r https://osm.etsi.org/gitweb/?p=osm/common.git;a=blob_plain;f=requirements.txt;hb=v13.0