New features and improvements

[crimsonred]

• QueryParams in all API calls
• d in grant
• maxIdleConnsPerHost setting in config
• Max concurrent workers for Publish and Grant requests

[codecov-io]

Codecov Report

Merging #53 into master will decrease coverage by 1.05%.
The diff coverage is 68%.

@@            Coverage Diff             @@
##           master      #53      +/-   ##
==========================================
- Coverage   83.87%   82.81%   -1.06%     
==========================================
  Files          36       37       +1     
  Lines        3677     3829     +152     
==========================================
+ Hits         3084     3171      +87     
- Misses        502      580      +78     
+ Partials       91       78      -13

Impacted Files	Coverage Δ
heartbeat_request.go	75% <0%> (-2.03%)	⬇️
unsubscribe_builder.go	62.5% <0%> (-14.43%)	⬇️
endpoints.go	93.54% <100%> (+0.44%)	⬆️
config.go	100% <100%> (ø)	⬆️
request.go	81.87% <100%> (+2.48%)	⬆️
publish_request.go	78.67% <100%> (+0.73%)	⬆️
clients.go	100% <100%> (ø)	⬆️
grant_request.go	97.65% <100%> (+7.21%)	⬆️
here_now_request.go	78.6% <16.66%> (-1.91%)	⬇️
subscribe_request.go	73.86% <16.66%> (-4.19%)	⬇️
... and 22 more

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