Adds acknowledgment form

LICENSE

@@ -8,3 +8,4 @@ Permission is granted to anyone to use this software for any purpose,including c
 - The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation is required.
 - Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
 - This notice may not be removed or altered from any source or binary distribution.
+- Redistributions of any form whatsoever must retain the following acknowledgment: 'This product includes software developed by the "Marcin Krzyzanowski" (http://krzyzanowskim.com/).'

README.md

@@ -425,6 +425,7 @@ Permission is granted to anyone to use this software for any purpose, including
 - The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, **an acknowledgment in the product documentation is required**.
 - Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
 - This notice may not be removed or altered from any source or binary distribution.
+- Redistributions of any form whatsoever must retain the following acknowledgment: 'This product includes software developed by the "Marcin Krzyzanowski" (http://krzyzanowskim.com/).'
 
 ## Changelog