Suggestion: move core-kernel dependency to devDependencies

[e-m-s-y]

Hey rsk,

I noticed that @arkecosystem/core-kernel is in your dependency list -> https://github.com/deadlock-delegate/notifier/blob/master/package.json#L35

I think this will break your plugin when running it on relay with core version > next.35. In this case your plugin will use a different version of core-kernel rather than the actual one the relay uses, however I'm not 100% sure on this. My suggestion is to move core-kernel to your devDependencies instead. I had similar issues with this in the past and now that next.36 is released it might be worth looking into.