Update LitElement to v2.

bicknellr · bicknellr · commit 993343bd966a · 2021-07-23T14:31:50.000-07:00
diff --git a/tachometer.json b/tachometer.json
@@ -46,9 +46,9 @@
         },
         {
           "packageVersions": {
-            "label": "previous-1.x-release",
+            "label": "previous-2.x-release",
             "dependencies": {
-              "lit-element": "^1"
+              "lit-element": "^2"
             }
           }
         }
