update images

Fix invalid content

README.md

@@ -1,4 +1,4 @@
-# SimpleXLSXGen class 0.9.19 (Official)
+# SimpleXLSXGen class 0.9.21 (Official)
 [<img src="https://img.shields.io/endpoint.svg?url=https%3A%2F%2Fshieldsio-patreon.herokuapp.com%2Fshuchkin" />](https://www.patreon.com/shuchkin) [<img src="https://img.shields.io/github/license/shuchkin/simplexlsxgen" />](https://github.com/shuchkin/simplexlsxgen/blob/master/license.md) [<img src="https://img.shields.io/github/stars/shuchkin/simplexlsxgen" />](https://github.com/shuchkin/simplexlsxgen/stargazers) [<img src="https://img.shields.io/github/forks/shuchkin/simplexlsxgen" />](https://github.com/shuchkin/simplexlsxgen/network) [<img src="https://img.shields.io/github/issues/shuchkin/simplexlsxgen" />](https://github.com/shuchkin/simplexlsxgen/issues)
 
 Export data to Excel XLSX file. PHP XLSX generator. No external tools and libraries.<br/>
@@ -42,8 +42,9 @@ $data = [
     ['Procent', '12%'],
     ['Datetime', '2020-05-20 02:38:00'],
     ['Date','2020-05-20'],
-    ['Time','02:38:00'], 
-    ['String', 'See SimpleXLSXGen column autosize feature']
+    ['Time','02:38:00'],
+    ['String', 'Long UTF-8 String in autoresized column'],
+    ['Disable Type Detection', "\0".'2020-10-04 16:02:00']
 ];
 SimpleXLSXGen::fromArray( $data )->saveAs('datatypes.xlsx');
 ```
@@ -62,6 +63,8 @@ SimpleXLSXGen::fromArray( $data )->saveAs('debug.xlsx');
 
 
 ## History
+v0.9.21 (2020-10-17) Updated images<br/>
+v0.9.20 (2020-10-04) Disable type detection if string started with chr(0)<br/>
 v0.9.19 (2020-08-23) Numbers like SKU right aligned now<br/>
 v0.9.18 (2020-08-22) Fixed fast shared strings index<br/> 
 v0.9.17 (2020-08-21) Fixed real numbers in 123.45 format detection, fast shared strings index (thx fredriksundin)<br/> 

src/SimpleXLSXGen.php

@@ -216,13 +216,14 @@ class SimpleXLSXGen {
 							$cs = 6; // [22] m/d/yy h:mm
 						} elseif ( mb_strlen( $v ) > 160 ) {
 							$ct = 'inlineStr';
-							$cv = str_replace(['&','<','>'],['&amp;','&lt;','&gt;'], $v);
+							$cv = str_replace(['&','<','>',"\x03"],['&amp;','&lt;','&gt;',''], $v);
 						} else {
 							if ( preg_match('/^[0-9+-.]+$/', $v ) ) { // Long ?
 								$cs = 7; // Align Right
 							}
+							$v = ltrim($v,"\0"); // disabled type detection
 							$ct = 's'; // shared string
-							$v = str_replace(['&','<','>'],['&amp;','&lt;','&gt;'], $v);
+							$v = str_replace(['&','<','>',"\x03"],['&amp;','&lt;','&gt;',''], $v);
 							$cv = false;
 							$skey = '~'.$v;
 							if ( isset($SI_KEYS[ $skey ]) ) {