Update options in the README

Copy in the current configuration of options from the `trustymail.cli`
module.

Author: mcdonnnj

README.md

@@ -61,8 +61,7 @@ output will always be written to disk, defaulting to `results.csv`.
   -h --help                   Show this message.
   -o --output=OUTFILE         Name of output file. (Default results)
   -t --timeout=TIMEOUT        The DNS lookup timeout in seconds. (Default is 5.)
-  --smtp-timeout=TIMEOUT      The SMTP connection timeout in seconds. (Default
-                              is 5.)
+  --smtp-timeout=TIMEOUT      The SMTP connection timeout in seconds. (Default is 5.)
   --smtp-localhost=HOSTNAME   The hostname to use when connecting to SMTP
                               servers.  (Default is the FQDN of the host from
                               which trustymail is being run.)
@@ -71,12 +70,13 @@ output will always be written to disk, defaulting to `results.csv`.
   --no-smtp-cache             Do not cache SMTP results during the run.  This
                               may results in slower scans due to testing the
                               same mail servers multiple times.
-  --mx                        Only check mx records
-  --starttls                  Only check mx records and STARTTLS support.
+  --mx                        Only check MX records
+  --starttls                  Only check MX records and STARTTLS support.
                               (Implies --mx.)
-  --spf                       Only check spf records
-  --dmarc                     Only check dmarc records
-  --debug                     Output should include error messages.
+  --spf                       Only check SPF records
+  --dmarc                     Only check DMARC records
+  --json                      Output is in json format (default csv)
+  --debug                     Output should include more verbose logging.
   --dns=HOSTNAMES             A comma-delimited list of DNS servers to query
                               against.  For example, if you want to use
                               Google's DNS then you would use the