v0.4.0

Added

• feat!(builder): merge response schemas per status code
• feat!(cli): remove unused --param-regex flag

Other

• (readme) remove --param-regex mention from CLI reference
• (cli) verify --param-regex is rejected as unknown argument
• (builder) cover multi-status response aggregation
• refactor!(error): mark Error enum as non_exhaustive
• regenerate demo.gif [skip ci]