Add 'Configure' button to rls-missing notification

Author: alexheretic

lib/index.js

@@ -191,7 +191,11 @@ function checkRls(busySignalService) {
       .catch(e => {
         atom.notifications.addError(`\`rls-preview\` was not found on \`${toolchain}\``, {
           detail: 'Try configuring another toolchain, like a previous nightly or `beta`',
-          dismissable: true
+          dismissable: true,
+          buttons: [{
+            text: 'Configure',
+            onDidClick: () => atom.workspace.open('atom://config/packages/ide-rust')
+          }]
         })
         e._logged = true
         throw e