6d026765_Plugin_YAML___BukkitWiki_Attributes_Notes
[Attribute] version [Required] yes [Description] The version of this plugin. [Example] version: 1.4.1 [Notes] 
Version is an arbitrary string, however the most common format is MajorRelease.MinorRelease.Build (eg: 1.4.1). Typically you will increment this every time you release a new feature or bug fix. Displayed when a user types /version PluginName
Plugin YAML - BukkitWiki
Notes