Add release summary section#654

Merged

olleolleolle merged 5 commits intogithub-changelog-generator:masterfrom

mob-sakai:release-summary

Sep 20, 2018

Commits on May 23, 2018

Add release summary section
Takashi Sakai
committed

Commits on May 24, 2018

Add label option for release summary section
Takashi Sakai
committed
'issue_line_body' option is unnecessary to add release summary section
mob-sakai
committed

Commits on May 27, 2018

Change default option for 'summary-labels'
mob-sakai
committed
Add man page for release summary options
mob-sakai
committed