Add -h and -V options

Basic getopts version:

  #-----------------------------------------------------------------------
  #  Handle command line arguments
  #-----------------------------------------------------------------------
  while getopts ":hV" opt
  do
    # shellcheck disable=SC2214
    case "${opt}" in

      h|help      ) _usage;    exit 0 ;;
      V|version   ) _version;  

Issue #30 made me realise that manly only works on english man pages. Luckily it appears to only be the case, because of the regex here https://github.com/carlbordum/manly/blob/master/manly.py#L154 that parses the title/NAME.

Currently it crashes with the rather cryptic error

Traceback (most recent call last):
  File "manly.py", line 191, in <module>
    main()
  File "manly.py", lin