Removed unused variable.

Author: jocic

source/Jocic/Encoders/Base/Base64.php

@@ -477,7 +477,6 @@ public function mergeEncodingChunks($chunks)
             // Algorithm Variables
 
             $rMasks   = [ 0x3F, 0x0F, 0x03, 0x0F ];
-            $rShifts  = [ 0x00, 0x3F, 0x03, 0x00 ];
             $cIndexes = [ 0x00, 0x01, 0x01, 0x01 ];
             $dShifts  = [ 0x00, 0x02, 0x04, 0x06 ];
             $bShifts  = [ 0x00, 0x04, 0x02, 0x00 ];