feat(rules): add 'no-jest-import' rule to the recommended config (#99)

Fixes #98

README.md

@@ -86,6 +86,7 @@ for more information about extending configuration files.
 | [no-focused-tests](docs/rules/no-focused-tests.md) | Disallow focused tests | ![recommended](https://img.shields.io/badge/-recommended-lightgrey.svg) | |
 | [no-hooks](docs/rules/no-hooks.md) | Disallow setup and teardown hooks | | |
 | [no-identical-title](docs/rules/no-identical-title.md) | Disallow identical titles | ![recommended](https://img.shields.io/badge/-recommended-lightgrey.svg) | |
+| [no-jest-import](docs/rules/no-jest-import.md) | Disallow importing `jest` | ![recommended](https://img.shields.io/badge/-recommended-lightgrey.svg) | |
 | [no-large-snapshots](docs/rules/no-large-snapshots.md) | Disallow large snapshots | | |
 | [no-test-prefixes](docs/rules/no-test-prefixes.md) | Disallow using `f` & `x` prefixes to define focused/skipped tests | | ![fixable](https://img.shields.io/badge/-fixable-green.svg) |
 | [prefer-to-have-length](docs/rules/prefer-to-have-length.md) | Suggest using `toHaveLength()` | ![recommended](https://img.shields.io/badge/-recommended-lightgrey.svg) | ![fixable](https://img.shields.io/badge/-fixable-green.svg) |

index.js

@@ -30,6 +30,7 @@ module.exports = {
  'jest/no-disabled-tests': 'warn',
  'jest/no-focused-tests': 'error',
  'jest/no-identical-title': 'error',
+ 'jest/no-jest-import': 'warn',
  'jest/prefer-to-have-length': 'warn',
  'jest/valid-expect': 'error',
  },