consistent plus-to-space defaults

[alandefreitas]

fix #237

[cppalliance-bot]

GCOVR code coverage report https://567.url.prtest.cppalliance.org/gcovr/index.html
LCOV code coverage report https://567.url.prtest.cppalliance.org/genhtml/index.html

[codecov[bot]]

Codecov Report

Merging #567 (2b4bd01) into develop (ecdc8f1) will increase coverage by 0.01%. The diff coverage is 100.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #567      +/-   ##
===========================================
+ Coverage    96.81%   96.83%   +0.01%     
===========================================
  Files          139      139              
  Lines         6691     6693       +2     
===========================================
+ Hits          6478     6481       +3     
+ Misses         213      212       -1     

Impacted Files	Coverage Δ
include/boost/url/impl/url_base.ipp	99.11% <100.00%> (+0.09%)	:arrow_up:
include/boost/url/url_view_base.hpp	100.00% <100.00%> (ø)

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[cppalliance-bot]

GCOVR code coverage report https://567.url.prtest.cppalliance.org/gcovr/index.html
LCOV code coverage report https://567.url.prtest.cppalliance.org/genhtml/index.html

[alandefreitas]

https://github.com/vinniefalco/url/commits/query supersedes that