Compatibility and version matrix

Due to the introduction of the Reporting feature we had to split the latest Timetracker plugin to two versions. Timetracker versions and compatibility:

• The latest 3.x version of the plugin has the same functionality as the latest 2.6.x version and compatible with JIRA 7.x and above.
• The latest 2.6.x version of the plugin compatible with JIRA 6.3.0 to 6.4.14
• The version 1.x is compatible with older Jira versions but it is not supported anymore.