Update Merge Intervals solution and difficulty#287

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jayvenn wants to merge 3 commits intosoapyigu:masterfrom jayvenn:master

+33-49

Commits on Dec 28, 2019

Update deprecated solution with new method signature and removal of Interval class definition
nhantrivinh1
committed
Mirror Merge Intervals question difficulty definition with LeetCode link
nhantrivinh1
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Update Swift naming convention in accordance with latest style guide and simplify value reference in for-loop
nhantrivinh1
committed