Merge pull request #1324 from aidanf/patch-2

Update free-programming-books.md
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victor felder 2015-02-05 12:39:13 +01:00
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### Swift
* [The Swift Programming Language](https://itunes.apple.com/us/book/swift-programming-language/id881256329?mt=11) (iBook)
* [Using Swift with Cocoa and Objective-C](https://itunes.apple.com/us/book/using-swift-cocoa-objective/id888894773?mt=11) (iBook)
* [Learn Swift](http://www.swift-tutorial.io/learn-swift)
### Tcl
* [Tcl Programming](http://en.wikibooks.org/wiki/Programming%3ATcl), by Richard.Suchenwirth, et. al.