Google Drive & Docs for Confluence wanted small improvements in release management

[#1]

Hi! 

Google Drive & Docs for Confluence  is one my favorite app for Confluence.

on the large system, we need to be sure everything is ok, and sometimes is confusing make everything manually.

Therefore I do some update on automatic way, it will be great if your app will follow semver. 

Semantic versioning is quite common solution/contract, which helps to easier make some changes for the system. 

 Because versions like 151, 152, 153, 155 is quite uninformative to me :( 

And please, add more highlights  :) I think it will be useful for the users. 

Cheers,

Gonchik Tsymzhitov