Update README.md badges.
Update README.md badges.

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psychoss/html-minifier,jonnochoo/html-minifier,bryanerayner/html-minifier,kangax/html-lint,MacManus/html-minifier,jonnochoo/html-minifier,GerHobbelt/html-minifier,AshKyd/html-minifier,psychoss/html-minifier,bryanerayner/html-minifier,MacManus/html-minifier,kangax/html-minifier,kangax/html-lint,AshKyd/html-minifier,DChristiany/html-minifier,DChristiany/html-minifier,kangax/html-minifier,GerHobbelt/html-minifier