Merge pull request airbrake#115 from airbrake/release-0-8-0

Release v0.8.0

Release v0.7.5 (airbrake#110)

Merge pull request airbrake#109 from airbrake/release-0-7-4

Release v0.7.4

Merge pull request airbrake#101 from TheoKouzelis/fix/issue-97-monolog-2

Add support for Monolog 2

Merge pull request airbrake#91 from anmic/fix/http-client-timeout

Increase the Guzzle HTTP Client timeout.

Save nested exception. (airbrake#90)