Able to set NoColor for echo.Logger and echo.middleware.Logger

[wsw0108]

close #1871

[codecov[bot]]

Codecov Report

Merging #2159 (057a053) into master (572466d) will decrease coverage by 0.17%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #2159      +/-   ##
==========================================
- Coverage   92.20%   92.02%   -0.18%     
==========================================
  Files          37       37              
  Lines        3090     3096       +6     
==========================================
  Hits         2849     2849              
- Misses        151      154       +3     
- Partials       90       93       +3     

Impacted Files	Coverage Δ
echo.go	93.96% <0.00%> (-1.21%)	:arrow_down:
middleware/logger.go	85.71% <0.00%> (-1.56%)	:arrow_down:

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[lammel]

This strongly relates to v5, as coloring is removed there entirely. So adding a new parameter would mean a breaking change (or having to deprecate it with v5).

Not sure if we should do that now. Your views welcome