updating to 4.0

New design with breaking changes, gulp 4, all dependencies updated, dev environment changed, and many more changes

js/demo/chart-pie-demo.js

@@ -0,0 +1,16 @@
+// Set new default font family and font color to mimic Bootstrap's default styling
+Chart.defaults.global.defaultFontFamily = '-apple-system,system-ui,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif';
+Chart.defaults.global.defaultFontColor = '#292b2c';
+
+// Pie Chart Example
+var ctx = document.getElementById("myPieChart");
+var myPieChart = new Chart(ctx, {
+  type: 'pie',
+  data: {
+    labels: ["Blue", "Red", "Yellow", "Green"],
+    datasets: [{
+      data: [12.21, 15.58, 11.25, 8.32],
+      backgroundColor: ['#007bff', '#dc3545', '#ffc107', '#28a745'],
+    }],
+  },
+});