[fix] #376: Add missing sys import

silkaj/wot_tools.py

@@ -13,6 +13,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with Silkaj. If not, see <https://www.gnu.org/licenses/>.
 
+import sys
 import urllib
 
 from duniterpy.api.bma import wot