Add update api

src/main/java/de/jeyp91/tippliga/TippligaSQLConnector.java

@@ -126,9 +126,19 @@ public class TippligaSQLConnector {
         try {
             stmt = con.createStatement();
             rset = stmt.executeQuery(queryString);
-        } catch (SQLException throwables) {
-            throwables.printStackTrace();
+        } catch (SQLException e) {
+            logger.error(e.getStackTrace());
         }
         return rset;
     }
+
+    public void executeUpdate (String queryString){
+        Statement stmt;
+        try {
+            stmt = con.createStatement();
+            stmt.executeUpdate(queryString);
+        } catch (SQLException e) {
+            logger.error(e.getStackTrace());
+        }
+    }
 }