fix: minus temperaturen

WEBROOT/services/weather_chart.php

@@ -42,7 +42,7 @@ $conn->close();
                 data: <?php echo json_encode($data); ?>,
                 borderColor: 'rgba(75, 192, 192, 1)',
                 backgroundColor: 'rgba(75, 192, 192, 0.2)',
-                fill: true,
+                fill: false,
                 tension: 0
             }]
         },
@@ -82,7 +82,7 @@ $conn->close();
                     }
                 },
                 y: {
-                    min: 0,
+                    min: -10,
                     max: 40,
                     title: {
                         display: true,