add two more katas for `[].fill()` from MDN#56

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jizusun:more-katas

Commits on Oct 26, 2018

add two more katas for `[].fill()` from MDN
jizusun
committed

Commits on Nov 7, 2018

Update katas/es6/language/array-api/fill.js

wolframkriesing
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jizusun
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Commits on Nov 22, 2018