Update docs to 0.23 release (#172)
Update docs to 0.23 release (#172)

fixes: https://github.com/cpp-pm/hunter/issues/124
dan-42/hunter,NeroBurner/hunter,NeroBurner/hunter,NeroBurner/hunter,dan-42/hunter,NeroBurner/hunter,dan-42/hunter,dan-42/hunter