Update authors

AUTHORS

@@ -6,9 +6,13 @@ Anton Schukin <[email protected]>
 Diego Sánchez <[email protected]>
 Victor Shamanov <[email protected]>
 Mikhail Gasanov <[email protected]>
+Alexandr Nikishin <[email protected]>
+Alexander Balaban <[email protected]>
 Igor Kashkuta <[email protected]>
 Zhao Wang <[email protected]>
-Viacheslav Radchenko <[email protected]>
+Serhii Zabrodko <[email protected]>
+Ruslan Ahapkin <[email protected]>
+Igor Savelev <[email protected]>
 
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