Bump version number.

composer.json

 {
 	"name": "sotastudio/flexslider",
 	"description": "Brings WooThemes awesome responsive Slider to TYPO3",
-	"version": "1.5.2",
+	"version": "1.5.3",
 	"type": "typo3-cms-extension",
 	"keywords": ["responsive", "rwd", "mobile", "slider", "slideshow", "flexslider"],
 	"homepage": "https://sota-studio.de",

ext_emconf.php

@@ -4,7 +4,7 @@ $EM_CONF[$_EXTKEY] = array(
 	'title' => 'FlexSlider',
 	'description' => 'Brings WooThemes\' awesome responsive Slider to TYPO3',
 	'category' => 'plugin',
-	'version' => '1.5.2',
+	'version' => '1.5.3',
 	'state' => 'stable',
 	'uploadfolder' => 1,
 	'createDirs' => '',