php56-http: rebuild bottle against libevent 2.1.8
php56-http: rebuild bottle against libevent 2.1.8

`php56-http` is bottled against `libevent-2.0.5.dylib`
the current bottled version of libevent is  `2.1.8`
`revision +1` to rebuild the bottle

Closes #4110.

Signed-off-by: Jan Viljanen <78474235ba423d1a061bae6ab658873ced03ce9c@greenpeace.org>

dguyon/homebrew-php