ARROW-1841: [JS] Update text-encoding-utf-8 and tslib for node ESModules support#1338

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trxcllnt wants to merge 2 commits intoapache:masterfrom

trxcllnt:update-text-encoding-utf8

Commits on Nov 20, 2017

update text-encoding-utf-8 dependency with node ESModules support
trxcllnt
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Commits on Nov 21, 2017

synthesize an mjs file for tslib on postinstall
trxcllnt
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