add support for ESLint v6

[wareczek]

No description provided.

[G-Rath]

I assume this is b/c you get deprecation warnings?

This'll be upgraded as part of #410, as it requires us to drop Node 6 support.

[wareczek]

@G-Rath I mean devDependency support for ^6 there:
https://github.com/jest-community/eslint-plugin-jest/blob/master/package.json#L56

Something like this:
https://github.com/airbnb/javascript/blob/master/packages/eslint-config-airbnb/package.json#L66

[SimenB]

devDependency doesn't matter for you - it's only local to this repository. The plugin should already support eslint v6 (we use those together at work). it's in our peerDependency range already, so there's nothing for us to do here.

eslint-plugin-jest/package.json

Lines 25 to 27 in 8c850ff

	"peerDependencies": {
	"eslint": ">=5"
	},

unless you're getting some kind of warning or error when using this with eslint 6, I'll close this