Release 8.0.0-beta and update release notes 

Release 7.6.0 and update release notes 

Release 7.5.1 and update release notes 

Release 7.5.0 and update release notes 

Release 7.4.1 and update release notes 

Release 7.4.0 and update release notes 

Fix java doc, Update release notes and Release 7.3.0 

Fix appium#1208 (appium#1209) This reverts commit 6d0de81.

Apply Maven publish plugin and Release 7.1.0 

Update changelog in readme