3 errata corriage#6

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LucaPaterlini wants to merge 3 commits intoPacktPublishing:masterfrom

LucaPaterlini:master

Commits on Jul 28, 2019

chapter 1 added anonymous function (wrong implmentation page 21)
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chapter 1 added closures (wrong implmentation page 22)
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chapter 1 added the encoding package snippet (wrong implmentation page 43 return carriage before json)
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