Inatra exercise complited#4

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NickelGit wants to merge 8 commits intodevelopfrom

Commits on Apr 24, 2020

Inatra exercise comlited
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Commits on Apr 25, 2020

POST method added
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Commits on Apr 27, 2020

multimethods feature added. Style fixes in tests
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Commits on Apr 28, 2020

Commits on Apr 29, 2020