Fixed broken Golang link in TR section (#2018)

free-programming-books-tr.md

@@ -71,7 +71,7 @@
 
 ### Go
 
-* [Go Turu](http://tur.a.golang.org.tr)
+* [Go Turu](https://go-tour-turkish.appspot.com/welcome/1)
 
 
 ### Html