Use JSON schema default in rules

[sindresorhus]

Instead of manual Object.assign. See: eslint/eslint@550de1e

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[GMartigny]

Problem is, the default keyword doesn't seems to work with unnamed options (outside of a properties keyword).

eg: Adding a default: 5 to

eslint-plugin-ava/rules/max-asserts.js

Lines 58 to 60 in c5a77bb

	const schema = [{
	type: 'integer'
	}];

don't inject 5 in an empty ([]) options list.

The specifications don't say anything about this case.

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