Fixed CHANGELOG.md (#1704)
Fixed CHANGELOG.md (#1704)

Fixes that swapped commit URLs of ABAP and Erlang for release 1.8.4 (2017-11-05). 
CupOfTea696/prism,PrismJS/prism,PrismJS/prism,PrismJS/prism,PrismJS/prism,CupOfTea696/prism,CupOfTea696/prism,CupOfTea696/prism,CupOfTea696/prism,PrismJS/prism