App::perlbrew POD: add =encoding utf8
App::perlbrew POD: add =encoding utf8

Since UTF-8 characters were added to the POD in 8ac6befd23 we need to
have =encoding utf8 at the top so that POD formatters will format it
correctly.

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