Bump rack from 2.0.3 to 2.2.3#4

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dependabot[bot] wants to merge 4 commits intomasterfrom

dependabot/bundler/rack-2.2.3

Commits on Jan 12, 2018

Adds nested namespace
charusat09
committed

Commits on Jan 16, 2018

Adds Demo for Nested Resources
charusat09
committed

Commits on Nov 27, 2020