install aglio failed with node 11 as drafter library is too low

install agio with node 11 always failed, due to
aglio depends on
"drafter": "^1.0.0",
while drafter 1.0.0 depends on
"protagonist": "^1.6.0"

protagonist 1.6.0 compiles failed with node 11, while protagonist 2.0.0 compiles well with node 11.

please update drafter version to 2.0.0 to solve this problem.

thanks ahead.

Inspect aglio's drafter dependency declaration and reproduce installation with Node 11. Confirm that the updated dependency resolves to a protagonist version that compiles successfully and that installation completes without errors.

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