message: Mark change as breaking in changelog
diff: - `[expect]` Standardize file naming in `expect` ([#7306](https://github.com/facebook/jest/pull/7306))
  - `[jest-each]` Add empty array validation check ([#7249](https://github.com/facebook/jest/pull/7249))
  - `[jest-cli]` Interrupt tests if interactive watch plugin key is pressed ([#7222](https://github.com/facebook/jest/pull/7222))
  -- `[jest-cli]` Fix coverage summary reporting ([#7058](https://github.com/facebook/jest/pull/7058))
  +- `[jest-cli]` [**BREAKING**] Do not use `text` coverage reporter by default if other reporters are configured ([#7058](https://github.com/facebook/jest/pull/7058))
  - `[jest-each]` Add each array validation check ([#7033](https://github.com/facebook/jest/pull/7033))
  - `[jest-haste-map]` Do not visit again files with the same sha-1 ([#6990](https://github.com/facebook/jest/pull/6990))
  - `[jest-jasmine2]` Fix memory leak in Error objects hold by the framework ([#6965](https://github.com/facebook/jest/pull/6965))
  