New upstream version 1.4.2

.travis.yml

CHANGELOG.md

README.md

alt_exit.go

alt_exit_test.go

entry.go

entry_test.go

example_custom_caller_test.go

example_default_field_value_test.go

example_global_hook_test.go

exported.go

go.mod

go.sum

hook_test.go

internal/testutils/testutils.go

json_formatter.go

logger.go

logger_test.go

logrus.go

logrus_test.go