Update README.md

Correct link without SSL error
Merge pull request #14 from lucasff/patch-1

Update README.md
Altera composer pra conseguirmos utilizar o fork
Ajusta composer
Adiciona metodo setEnvironment
composer.json original
Merge branch 'desenvolvimento'
Several documentation improvements.
Merge pull request #15 from dindigital/pullrequest

Adicionando método setEnvironment na PagSeguroConfig
Merge pull request #16 from amaurymedeiros/master

Several documentation improvements
Atualizacao do readme e versionamento