Remove unnecessary "plugins" from example config

[Strajk]

Hi 👋 First of all, thanks for your work 👍

I've noticed that there is an unnecessary plugins field in the example config. The plugin is already included in the meteor/recommended config which is being extended https://github.com/dferber90/eslint-plugin-meteor/blob/master/lib/index.js#L24

Examples from other repos:

React https://github.com/yannickcr/eslint-plugin-react

• only extends in the example config
• plugin included in config https://github.com/yannickcr/eslint-plugin-react/blob/master/index.js#L152

Vue https://github.com/vuejs/eslint-plugin-vue

• only extends in the example config
• plugin included in config https://github.com/vuejs/eslint-plugin-vue/blob/80b8983118cc08cf473642c05413bcb930c93613/lib/configs/base.js#L16

[dferber90]

Thanks for your PR and for caring about eslint-plugin-meteor. I decided not to merge the PR as not every user will use "extends": ["plugin:meteor/recommended"]. Some might just want to define the rules individually, in which case they'll need to register the plugin..

So it's good to show how the plugin can be registered by default. There's also no harm in registering it twice. Hope this is understandable ☺️

[Strajk]

@dferber90 no worries, thanks for explanation :) keep up the great work 👏