feat: add prefer-to-be to style ruleset

BREAKING CHANGE: recommend `prefer-to-be` rule

Author: G-Rath

README.md

@@ -183,7 +183,7 @@ installations requiring long-term consistency.
 | [prefer-hooks-on-top](docs/rules/prefer-hooks-on-top.md)                     | Suggest having hooks before any test cases                          |                  |              |
 | [prefer-spy-on](docs/rules/prefer-spy-on.md)                                 | Suggest using `jest.spyOn()`                                        |                  | ![fixable][] |
 | [prefer-strict-equal](docs/rules/prefer-strict-equal.md)                     | Suggest using `toStrictEqual()`                                     |                  | ![suggest][] |
-| [prefer-to-be](docs/rules/prefer-to-be.md)                                   | Suggest using `toBe()` for primitive literals                       |                  | ![fixable][] |
+| [prefer-to-be](docs/rules/prefer-to-be.md)                                   | Suggest using `toBe()` for primitive literals                       | ![style][]       | ![fixable][] |
 | [prefer-to-contain](docs/rules/prefer-to-contain.md)                         | Suggest using `toContain()`                                         | ![style][]       | ![fixable][] |
 | [prefer-to-have-length](docs/rules/prefer-to-have-length.md)                 | Suggest using `toHaveLength()`                                      | ![style][]       | ![fixable][] |
 | [prefer-todo](docs/rules/prefer-todo.md)                                     | Suggest using `test.todo`                                           |                  | ![fixable][] |

src/__tests__/__snapshots__/rules.test.ts.snap

@@ -90,6 +90,7 @@ Object {
     ],
     "rules": Object {
       "jest/no-alias-methods": "warn",
+      "jest/prefer-to-be": "error",
       "jest/prefer-to-be-null": "error",
       "jest/prefer-to-be-undefined": "error",
       "jest/prefer-to-contain": "error",

src/index.ts

@@ -73,6 +73,7 @@ export = {
       plugins: ['jest'],
       rules: {
         'jest/no-alias-methods': 'warn',
+        'jest/prefer-to-be': 'error',
         'jest/prefer-to-be-null': 'error',
         'jest/prefer-to-be-undefined': 'error',
         'jest/prefer-to-contain': 'error',