update changelog with list of related pull requests.
update changelog with list of related pull requests.

ptolemarch/App-perlbrew,josl/App-perlbrew,rafl/App-perlbrew,Asuza/App-perlbrew,Asuza/App-perlbrew,rafl/App-perlbrew,josl/App-perlbrew,ptolemarch/App-perlbrew,Asuza/App-perlbrew,josl/App-perlbrew,ptolemarch/App-perlbrew,rafl/App-perlbrew,calid/App-perlbrew,calid/App-perlbrew