update the version to v5.2.1 (#587)

Author: Sharon Shabtai

build.gradle

@@ -36,7 +36,7 @@ plugins {
 
 allprojects {
     group = 'com.spectralogic.ds3'
-    version = '5.2.0'
+    version = '5.2.1'
 }
 
 subprojects {