Describe the bug

null values are colorized with a low-contrast, almost black foreground that makes the value nearly invisible on many terminals.

To Reproduce

1. Set Terminal.app to "Homebrew" theme.
2. Process a null value through jq onto stdout.

Expected behavior

The null should be clearly visible.

Environment (please complete the following information):

• OS and Version: macOS Catalina
• jq version 1.6