Update to prevent the installer requesting admin

[hughwilliams94]

Added PrivilegesRequired=lowest as per http://www.jrsoftware.org/ishelp/index.php?topic=setup_privilegesrequired

[codecov]

Codecov Report

Merging #424 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #424   +/-   ##
======================================
  Coverage    7.25%   7.25%           
======================================
  Files          41      41           
  Lines        2662    2662           
======================================
  Hits          193     193           
  Misses       2469    2469

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[coveralls]

Coverage remained the same at 7.26% when pulling e11c8a5 on hughwilliams94:patch-1 into 5f7046e on IJHack:master.

[annejan]

Thank you very much @hughwilliams94

[ahippo]

This seems to also break updates.

Had to Right Click -> "Run as administrator" to work around this.
OS: Windows 8.1.