Depend on lit-html prerelease

Author: justinfagnani

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "lit-element",
-  "version": "2.4.0-pre.1",
+  "version": "2.4.0-pre.2",
   "description": "A simple base class for creating fast, lightweight web components",
   "license": "BSD-3-Clause",
   "homepage": "https://lit-element.polymer-project.org/",
@@ -74,7 +74,7 @@
     }
   },
   "dependencies": {
-    "lit-html": "^1.1.1"
+    "lit-html": "1.3.0-pre.1"
   },
   "publishConfig": {
     "access": "public"

package.json

@@ -74,7 +74,7 @@ declare global {
 // This line will be used in regexes to search for LitElement usage.
 // TODO(justinfagnani): inject version number at build time
 (window['litElementVersions'] || (window['litElementVersions'] = []))
-    .push('2.3.1');
+    .push('2.4.0-pre.2');
 
 export type CSSResultOrNative = CSSResult|CSSStyleSheet;