update week306.md

iOS-Goodies · Oct 27, 2019 · 947867d · 947867d
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 * [Discover Side Tables - Weak Reference Management Concept in Swift](https://maximeremenko.com/swift-arc-weak-references), by [@eremenko_maxim](https://twitter.com/eremenko_maxim)
 
+[All about Swift Optionals](https://medium.com/@fadyossama/all-about-swift-optional-25a4a31e06f5), by [Fadi Ossama]
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 **Tools/Controls**
 
 * 
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 **Credits**
 
-* [devMEremenko](https://github.com/devMEremenko/), [fassko](https://github.com/fassko/)
+* [devMEremenko](https://github.com/devMEremenko/), [fassko](https://github.com/fassko/), [FadiOssama](https://github.com/FadiOssama)