Only shut down Logger if the application is being actually started

Signed-off-by: José Valim <jose.valim@plataformatec.com.br>
Merge pull request #2950 from tonini/remove-dumb-terminal-warning

warning about dumb terminal just irritates users

Signed-off-by: José Valim <jose.valim@plataformatec.com.br>
Update CHANGELOG