fix(package): update preact to version 10.4.1

Closes #339

Author: greenkeeper[bot]

package.json

@@ -88,7 +88,7 @@
     "webpack-dev-server": "^2.4.4"
   },
   "dependencies": {
-    "preact": "^8.1.0",
+    "preact": "^10.4.1",
     "preact-compat": "^3.15.0",
     "preact-render-to-string": "^3.6.0",
     "preact-router": "^2.5.1",