Release 0.8.4.0 2018-03-05

[Wally73]

0.8.4.0 2018-03-05
Changed:
   * Updated dependencies.
   * Refactored the Verify command to make some new coming stuff easier. Note: Check command's help
    for any changes to syntax.
   * Updated PHPMailer from v5.1 to v6.0

Fix:
   * Issue where updating failed because of git detached head. Correctly detects branch now.
    Closes issue 2530.