Merge pull request #22 from QGEP/fix444

Missing update to QGIS 3

Author: 3nids

src/tools/qgepnetwork.py

@@ -185,7 +185,7 @@ def refresh(self):
         query = QSqlQuery(db)
         if not query.exec_(query_template):
             str_result = query.lastError().text()
-            self.message_emitted.emit(self.tr("Warning"), str_result, QgsMessageBar.CRITICAL)
+            self.message_emitted.emit(self.tr("Warning"), str_result, Qgis.Critical)
         else:
             self.message_emitted.emit(self.tr("Success"), "vw_network_node successfully updated", Qgis.Success)
         # recreate networkx graph