feat(rules): add rule prefer-includes (#148) (#225)

BREAKING CHANGE: add rule prefer-includes:
https://github.com/typescript-eslint/typescript-eslint/blob/master/packages/eslint-plugin/docs/rules/prefer-includes.md

Author: toddbluhm

src/index.test.ts

@@ -112,6 +112,7 @@ test('export', (t): void => {
           '@typescript-eslint/no-useless-constructor': 'error',
           '@typescript-eslint/no-var-requires': 'error',
           '@typescript-eslint/prefer-function-type': 'error',
+          '@typescript-eslint/prefer-includes': 'error',
           '@typescript-eslint/prefer-nullish-coalescing': ['error', { ignoreConditionalTests: false, ignoreMixedLogicalExpressions: false }],
           '@typescript-eslint/prefer-optional-chain': 'error',
           '@typescript-eslint/prefer-readonly': 'error',

src/index.ts

@@ -95,6 +95,7 @@ export = {
         '@typescript-eslint/no-unnecessary-type-assertion': 'error',
         '@typescript-eslint/no-var-requires': 'error',
         '@typescript-eslint/prefer-function-type': 'error',
+        '@typescript-eslint/prefer-includes': 'error',
         '@typescript-eslint/prefer-nullish-coalescing': ['error', { ignoreConditionalTests: false, ignoreMixedLogicalExpressions: false }],
         '@typescript-eslint/prefer-optional-chain': 'error',
         '@typescript-eslint/prefer-readonly': 'error',