change shorthand command line option to specify host from -h to -H

[hlimbo]

• A minor bug fix:
• This is to avoid name clash with the shorthand command line option for help -h

Actual Behavior

Expected Behavior

[ghost]

DeepCode's analysis on #7fd2cd found:

• ❌ 0 critical issues. ⚠️ 0 warnings and 0 minor issues. ✔️ 0 issues were fixed.

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[coveralls]

Coverage decreased (-0.6%) to 94.351% when pulling 7fd2cd9 on hlimbo:bugfix/command_line_help_option_fix into c70aedf on Unity-Technologies:master.