Update README.md

Notes: when a sentence contains the agent and object of a transitive verb, clarity and directness of expression prefer the active voice over the passive. Similarly (though less seriously), the modal verb "will" is deadwood because, in this context, there's no difference between what stating what XPrivacy does and what XPrivacy will do.
edited installation, upgrading, and usage sections

Note: when an English sentence contains the agent and object for a verb, clarity and directness of expression require the active voice over the passive. Also, the modal verb "will" is frequently deadwood. In the present context, there's no difference in meaning between "XPrivacy will <do sth.>" and "XPrivacy <does sth.>."
Merge pull request #1278 from Jimmy34742/patch-1

Patch 1