Conform RuntimeError to HTTPResponseConvertible #96

Job	Run time
Unit tests / Construct unit test matrix	3s
Integration test / Windows (6.0)	1s
Integration test / Linux (5.9)	1m 39s
Integration test / Linux (5.10)	1m 39s
Integration test / Windows (nightly-6.0)	1s
Integration test / Linux (6.0)	1m 54s
Soundness / API breakage check	57s
Integration test / Windows (nightly-main)	1s
Integration test / Linux (nightly-6.0)	2m 18s
Integration test / Linux (nightly-main)	32s
Soundness / Broken symlinks check	5s
Soundness / Documentation check	1m 0s
Soundness / License headers check	4s
Soundness / Unacceptable language check	4s
Soundness / Format check	34s
Soundness / Shell check	30s
Soundness / Python lint check	6s
Soundness / YAML lint check	5s
Unit tests / Unit tests / Linux (5.9)	41s
Unit tests / Unit tests / Linux (5.10)	42s
Unit tests / Unit tests / Linux (6.0)	55s
Unit tests / Unit tests / Linux (nightly-6.0)	59s
	14m 50s

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