Update manifest.json for import_executor (#139)

* Update manifest.json

as per-discussion with @bdraco, this will limit/eliminate the time that `dyson_local` blocks the HA event loop.

fixes/solves #138

* Update custom_components/dyson_local/manifest.json

* Update custom_components/dyson_local/manifest.json

Co-authored-by: J. Nick Koston <nick@koston.org>

---------

Co-authored-by: Ben Vezzani <ben+github@vez.email>
Co-authored-by: J. Nick Koston <nick@koston.org>

custom_components/dyson_local/manifest.json

@@ -5,7 +5,9 @@
     "config_flow": true,
     "dependencies": ["mqtt", "zeroconf"],
     "documentation": "https://github.com/libdyson-wg/ha-dyson",
+    "import_executor": true,
     "iot_class": "local_push",
     "issue_tracker": "https://github.com/libdyson-wg/ha-dyson/issues",
-    "version": "1.3.10"
+    "version": "1.3.10",
+    "import_executor": true
 }