Fix time elapsed

[jkbrzt]

• show the actual time elapsed instead of time-to-parse-headers
• add docs for response meta

[codecov-commenter]

Codecov Report

Merging #1277 (9e44405) into master (4d7d6b6) will decrease coverage by 0.71%.
The diff coverage is 95.03%.

@@            Coverage Diff             @@
##           master    #1277      +/-   ##
==========================================
- Coverage   97.28%   96.57%   -0.72%     
==========================================
  Files          67       85      +18     
  Lines        4235     5952    +1717     
==========================================
+ Hits         4120     5748    +1628     
- Misses        115      204      +89     

Impacted Files	Coverage Δ
tests/test_binary.py	100.00% <ø> (ø)
httpie/compat.py	31.11% <27.90%> (-68.89%)	⬇️
tests/conftest.py	77.14% <58.33%> (-9.82%)	⬇️
httpie/output/lexers/http.py	59.09% <59.09%> (ø)
tests/test_ssl.py	91.01% <66.66%> (-3.93%)	⬇️
httpie/manager/__main__.py	82.35% <82.35%> (ø)
httpie/output/lexers/metadata.py	82.35% <82.35%> (ø)
httpie/models.py	94.23% <90.00%> (-3.14%)	⬇️
tests/test_uploads.py	97.66% <92.15%> (-2.34%)	⬇️
httpie/manager/core.py	92.85% <92.85%> (ø)
... and 68 more

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[isidentical]

You are faster than me 😄 (I was planning this on monday). The conditional body download seems a bit weird, considering how output options can change the total elapsed time but I guess there is no easy solution on that front. Maybe we might consider adding a warning in the future (Elapsed Time: 1.2042824 seconds (excluding time spent on the response body)) or using different keys but since it is documented I guess it is not a big deal.

[jkbrzt]

Yeah, the conditional body download, which is otherwise a good thing, makes the metrics less robust. The notice might be a good idea for a future iteration.