Added CHANGELOG.md into the documentation (#4443)
Added CHANGELOG.md into the documentation (#4443)

Currently, the documentation does not show the changelog
rafbgarcia/phoenix,nshafer/phoenix,optikfluffel/phoenix,optikfluffel/phoenix,nshafer/phoenix,phoenixframework/phoenix,optikfluffel/phoenix,phoenixframework/phoenix,0x00evil/phoenix,0x00evil/phoenix,phoenixframework/phoenix,nshafer/phoenix,rafbgarcia/phoenix,rafbgarcia/phoenix,0x00evil/phoenix