Conan package for RapidJSON use CMake's naming convention

[jgsogo]

Conan package for RapidJSON now uses the same naming convention as CMake module.

This change has been already submitted to ConanCenter for existing packages: https://github.com/conan-io/conan-center-index/pull/1579, sending it here so the next versions no longer need to apply the patch.

Let's take care of this project 💪

[codecov[bot]]

Codecov Report

Merging #197 into master will increase coverage by 0.00%. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #197   +/-   ##
=======================================
  Coverage   88.82%   88.82%           
=======================================
  Files          71       71           
  Lines        9072     9076    +4     
=======================================
+ Hits         8058     8062    +4     
  Misses       1014     1014           

Impacted Files	Coverage Δ
src/serialize_filters.cpp	96.79% <0.00%> (+0.07%)	:arrow_up:

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