Allow URLEncoding.httpBody as bodyEncoding in Task

[sunshinejr]

Fixes #1516.

[MoyaBot]

	1 Warning
⚠️	Consider adding supporting documentation to this change. Documentation can be found in the docs directory.

Generated by 🚫 Danger

[codecov-io]

Codecov Report

Merging #1557 into master will increase coverage by 5.48%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1557      +/-   ##
==========================================
+ Coverage   82.92%   88.41%   +5.48%     
==========================================
  Files           5        5              
  Lines         164      164              
==========================================
+ Hits          136      145       +9     
+ Misses         28       19       -9

Impacted Files	Coverage Δ
Sources/RxMoya/Observable+Response.swift	70.58% <0%> (+8.82%)	⬆️
Sources/ReactiveMoya/SignalProducer+Response.swift	90.9% <0%> (+9.09%)	⬆️
Sources/RxMoya/Single+Response.swift	100% <0%> (+12.5%)	⬆️

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[SD10]

LGTM ⛵️