Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Please make a code snippet demonstrating the bug using the following sample chart code:
+```
+public class TestForIssue834 {
+
+  public static void main(String[] args) throws ParseException {
+
+    XYChart chart = getXYChart();
+    new SwingWrapper(chart).displayChart();
+  }
+
+  public static XYChart getXYChart() {
+    XYChart chart =
+        new XYChartBuilder()
+            .width(720)
+            .height(480)
+            .title("Buggy Example")
+            .xAxisTitle("Count")
+            .yAxisTitle("Value")
+            .build();
+
+
+    double[] xValues = new double[] {1, 2, 3};
+    double[] yValues = new double[] {1, 2, 3};
+    chart.addSeries("main", xValues, yValues);
+
+    return chart;
+  }
+}
+```
+
+**Screenshots**
+Add screenshots to help explain your problem.
+
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.