Fix conversion of code 93

Author: casperbakker

.github/workflows/phpunit.yml

@@ -9,7 +9,7 @@ jobs:
 
     strategy:
       matrix:
-        php-versions: ['7.3', '7.4', '8.0']
+        php-versions: ['7.3', '7.4', '8.0', '8.1']
 
     steps:
     - uses: actions/checkout@v2

src/Types/TypeCode93.php

@@ -105,18 +105,18 @@ public function getBarcodeData(string $code): Barcode
             chr(33) => chr(129) . 'A',
             chr(34) => chr(129) . 'B',
             chr(35) => chr(129) . 'C',
-            chr(36) => chr(129) . 'D',
-            chr(37) => chr(129) . 'E',
+            chr(36) => chr(36), // "$"
+            chr(37) => chr(37), // "%"
             chr(38) => chr(129) . 'F',
             chr(39) => chr(129) . 'G',
             chr(40) => chr(129) . 'H',
             chr(41) => chr(129) . 'I',
             chr(42) => chr(129) . 'J',
-            chr(43) => chr(129) . 'K',
+            chr(43) => chr(43), // "+"
             chr(44) => chr(129) . 'L',
             chr(45) => '-',
             chr(46) => '.',
-            chr(47) => chr(129) . 'O',
+            chr(47) => chr(47), // "/"
             chr(48) => '0',
             chr(49) => '1',
             chr(50) => '2',