Update README.md

README.md

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 Gravity was supported by a couple of open-source projects. The inspiration for closures comes from the elegant <a href="http://www.lua.org" target="_blank">Lua</a> programming language; specifically from the document <a href="http://www.cs.tufts.edu/~nr/cs257/archive/roberto-ierusalimschy/closures-draft.pdf">Closures in Lua</a>. For fibers, upvalues handling and some parts of the garbage collector, my gratitude goes to <a href="http://journal.stuffwithstuff.com" target="_blank">Bob Nystrom</a> and his excellent <a href="https://github.com/munificent/wren">Wren</a> programming language. A very special thanks should also go to my friend **Andrea Donetti** who helped me debugging and testing various aspects of the language.
 
 ## Documentation
-The <a href="https://marcobambini.github.io/gravity/#/README">Getting Started</a> page is a guide for downloading and compiling the language. There is also a more extensive <a href="http://gravity-lang.org">language documentation</a>. Official [wiki](https://github.com/marcobambini/gravity/wiki) is used to collect related projects and tools.
+The <a href="https://marcobambini.github.io/gravity/#/README">Getting Started</a> page is a guide for downloading and compiling the language. There is also a more extensive <a href="https://gravity-lang.org">language documentation</a>. Official [wiki](https://github.com/marcobambini/gravity/wiki) is used to collect related projects and tools.
 
 ## Where Gravity is used
 * Gravity is the core language built into Creo (https://creolabs.com)