repolist.txt: Add ChakraCore branches release/{1.5, 1.5-ci, 1.6, 1.6-ci} (#675)
repolist.txt: Add ChakraCore branches release/{1.5, 1.5-ci, 1.6, 1.6-ci} (#675)


dotnet/dotnet-ci,tannergooding/dotnet-ci,mmitche/dotnet-ci,mmitche/dotnet-ci,tannergooding/dotnet-ci,dotnet/dotnet-ci