jest 13.1.0

• Added test global function as an alias for it.
• Added coveragePathIgnorePatterns to the config.
• Fixed printing of "JSX objects" in snapshots.
• Fixes for --verbose option and top level it calls.
• Extended the node environment with more globals.
• testcheck now needs to be required explicitly through require('jest-check').
• Added jest.deepUnmock.
• Fail test suite if it does not contain any tests.