chore(package): update preact to version 10.3.4

Closes #13

Author: greenkeeper[bot]

package.json

@@ -36,7 +36,7 @@
     "eslint-config-developit": "^1.1.1",
     "karmatic": "^1.0.6",
     "microbundle": "^0.4.3",
-    "preact": "^8.2.7",
+    "preact": "^10.3.4",
     "preact-context-provider": "^1.0.0"
   },
   "peerDependencies": {