Add report bug button

Changelog.md

@@ -3,6 +3,7 @@
 ## v0.3.0 - 1st February 2019
  - Installed a library to fix bugs in the device marker tabbing system
  - Add _rudimentary_ mobile device support. Note that this is not a priority until the design of the interface for desktop has been worked out.
+ - Add "report bug" button
 
 ## v0.2.0 - 26th January 2019
 The first entry!

client_src/js/UI.mjs

@@ -44,6 +44,13 @@ class UI {
 					this.map_manager.heatmap.update_reading_type(new_type);
 				}).bind(this)
 			},
+			{
+				type: "button",
+				name: "Report bug",
+				callback: ((_event) => {
+					window.open("https://github.com/ConnectedHumber/Air-Quality-Web/issues/new", "_blank");
+				})
+			},
 			{
 				type: "button",
 				name: `${Config.version}, built ${Config.build_date.toDateString()}`,