Update SimpleXLSXGen.php

Removing special characters known to me from the sheet name. Since if you do not delete these characters, then Excel says that the sheet is broken and offers to restore it.

src/SimpleXLSXGen.php

@@ -237,7 +237,7 @@ class SimpleXLSXGen
         if ($name === null) { // autogenerated sheet names
             $name = 'Sheet' . ($this->curSheet + 1);
         } else {
-            $name = mb_substr($name, 0, 31);
+            $name = mb_substr(str_replace(["/", "*", "/", "|", "\\", "[", "]", ":"], '', $name), 0, 31);
             $names = [];
             foreach ($this->sheets as $sh) {
                 $names[mb_strtoupper($sh['name'])] = 1;