Update go-cli dependency

[carlosms]

Update to make use of choice in log options, src-d/go-cli#9.

Before:

Usage:
  gitbase-web [OPTIONS] serve [serve-OPTIONS]

starts serving the application

Help Options:
  -h, --help                  Show this help message

[serve command options]
          --host=             IP address to bind the HTTP server (default: 0.0.0.0) [$GITBASEPG_HOST]
          --port=             Port to bind the HTTP server (default: 8080) [$GITBASEPG_PORT]
          --server=           URL used to access the application in the form 'HOSTNAME[:PORT]'. Leave it unset to allow connections from
                              any proxy or public address [$GITBASEPG_SERVER_URL]
          --db=               gitbase connection string. Use the DSN (Data Source Name) format described in the Go MySQL Driver docs:
                              https://github.com/go-sql-driver/mysql#dsn-data-source-name (default:
                              root@tcp(localhost:3306)/none?maxAllowedPacket=4194304) [$GITBASEPG_DB_CONNECTION]
          --select-limit=     Default 'LIMIT' forced on all the SQL queries done from the UI. Set it to 0 to remove any limit (default:
                              100) [$GITBASEPG_SELECT_LIMIT]
          --bblfsh=           Address where bblfsh server is listening (default: 127.0.0.1:9432) [$GITBASEPG_BBLFSH_SERVER_URL]
          --footer=           Allows to add any custom html to the page footer. It must be a string encoded in base64. Use it, for
                              example, to add your analytics tracking code snippet [$GITBASEPG_FOOTER_HTML]

    Log Options:
          --log-level=        Logging level (info, debug, warning or error) (default: info) [$LOG_LEVEL]
          --log-format=       log format (text or json), defaults to text on a terminal and json otherwise [$LOG_FORMAT]
          --log-fields=       default fields for the logger, specified in json [$LOG_FIELDS]
          --log-force-format  ignore if it is running on a terminal or not [$LOG_FORCE_FORMAT]

After

Usage:
  gitbase-web [OPTIONS] serve [serve-OPTIONS]

starts serving the application

Help Options:
  -h, --help                                     Show this help message

[serve command options]
          --host=                                IP address to bind the HTTP server (default: 0.0.0.0) [$GITBASEPG_HOST]
          --port=                                Port to bind the HTTP server (default: 8080) [$GITBASEPG_PORT]
          --server=                              URL used to access the application in the form 'HOSTNAME[:PORT]'. Leave it unset to
                                                 allow connections from any proxy or public address [$GITBASEPG_SERVER_URL]
          --db=                                  gitbase connection string. Use the DSN (Data Source Name) format described in the Go
                                                 MySQL Driver docs: https://github.com/go-sql-driver/mysql#dsn-data-source-name (default:
                                                 root@tcp(localhost:3306)/none?maxAllowedPacket=4194304) [$GITBASEPG_DB_CONNECTION]
          --select-limit=                        Default 'LIMIT' forced on all the SQL queries done from the UI. Set it to 0 to remove
                                                 any limit (default: 100) [$GITBASEPG_SELECT_LIMIT]
          --bblfsh=                              Address where bblfsh server is listening (default: 127.0.0.1:9432)
                                                 [$GITBASEPG_BBLFSH_SERVER_URL]
          --footer=                              Allows to add any custom html to the page footer. It must be a string encoded in base64.
                                                 Use it, for example, to add your analytics tracking code snippet [$GITBASEPG_FOOTER_HTML]

    Log Options:
          --log-level=[info|debug|warning|error] Logging level (default: info) [$LOG_LEVEL]
          --log-format=[text|json]               log format, defaults to text on a terminal and json otherwise [$LOG_FORMAT]
          --log-fields=                          default fields for the logger, specified in json [$LOG_FIELDS]
          --log-force-format                     ignore if it is running on a terminal or not [$LOG_FORCE_FORMAT]