Updated ChangeLog.md

Author: anton-evseev

src/ResourceManager/Network/ChangeLog.md

@@ -20,6 +20,8 @@
 
 ## Current Release
 
+* Bump up Network SDK version from 18.0.0-preview to 19.0.0-preview
+
 ## Version 6.0.0
 * Bump up network sdk version from 17.0.0.preview to 18.0.0.preview
 * Rerecord all network tests with latest sdk version* Set minimum dependency of module to PowerShell 5.0