Include the actual error message in exceptions.

[miracle2k]

resp.reason just tells me "Bad Request", which is not helpful in tracking down the problem.

[codecov[bot]]

Codecov Report

Merging #5 into master will increase coverage by 0.6%. The diff coverage is 100%.

@@           Coverage Diff            @@
##           master      #5     +/-   ##
========================================
+ Coverage      96%   96.6%   +0.6%     
========================================
  Files           4       4             
  Lines         275     265     -10     
========================================
- Hits          264     256      -8     
+ Misses         11       9      -2

Impacted Files	Coverage Δ
aioinflux/client.py	94.65% <100%> (-0.24%)	:arrow_down:
aioinflux/__init__.py	100% <0%> (ø)	:arrow_up:
aioinflux/serialization.py	98.16% <0%> (+1.73%)	:arrow_up:

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[gusutabopb]

Thanks!