add res.json in debug logs

[kim5566]

for the context https://github.com/segmentio/analytics-python/issues/481

[seg-atlantis-prod[bot]]

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[seg-atlantis-prod[bot]]

Error parsing command: EOF found when expecting closing quote

[MichaelGHSeg]

I'm very hesitant to make this change for all users of the library. Is this something you can patch locally for your own use?

[kim5566]

I'm very hesitant to make this change for all users of the library. Is this something you can patch locally for your own use?

sure i could patch locally