update readme. add image for cli downloader

Author: inhere

Diff for: README.md

@@ -157,32 +157,17 @@ $url  = 'http://no2.php.net/distributions/php-7.2.5.tar.bz2';
 $down = Download::file($url, '');
 
 // $down->setShowType('bar');
+// $down->setDebug(true);
 $down->start();
 ```
 
-**Progress bar output:**
+**Progress bar**
 
-```text
-Connected...
-Mime-type: text/html; charset=utf-8
-Being redirected to: http://no2.php.net/distributions/php-7.2.5.tar.bz2
-Connected...
-FileSize: 14280 kb
-Mime-type: application/octet-stream
-[========================================>                                                           ] 40% (3076/7590 kb)
-```
-
-**Progress text output:**
+![down-file-bar](./example/down-file-bar.jpg)
 
-```text
-Download: http://no2.php.net/distributions/php-7.2.5.tar.bz2
-Save As: /path/to/php-7.2.5.tar.bz2
+**Progress text**
 
-Connected ...
-Got the file size: 14280 kb
-Found the mime-type: application/octet-stream
-Made some progress, downloaded 641 kb so far
-```
+![down-file-txt-bar](./example/down-file-txt-bar.jpg)
 
 ## Projects 
 

Diff for: example/down-file-bar.jpg

@@ -149,8 +149,8 @@ public static function isSupportColor(): bool
         }
 
         $stream = STDOUT;
-        if (\DIRECTORY_SEPARATOR === '\\') {
-            return (\function_exists('sapi_windows_vt100_support')
+        if (DIRECTORY_SEPARATOR === '\\') {
+            return (function_exists('sapi_windows_vt100_support')
                     && @sapi_windows_vt100_support($stream))
                 || false !== getenv('ANSICON')
                 || 'ON' === getenv('ConEmuANSI')