deps: update editor to fix spaced background; alpha release

Author: tiye

package.json

@@ -1,6 +1,6 @@
 {
   "name": "stack-editor",
-  "version": "0.4.0-a2",
+  "version": "0.4.0-a3",
   "description": "Stack editor",
   "main": "index.js",
   "scripts": {

shadow-cljs.edn

@@ -4,7 +4,7 @@
     [mvc-works/hsl "0.1.2"]
     [cumulo/shallow-diff "0.1.3"]
     [mvc-works/shell-page "0.1.10"]
-    [cirru/editor "0.3.0-a1"]
+    [cirru/editor "0.3.0-a2"]
     [respo "0.12.1"]
     [respo/ui "0.3.14"]
     [cljs-ajax "0.8.0"]