updating docs with the uid flag

- no current docs document this flag, which works on 0.11.0 (and probably earlier)
- found in #82 and referenced in #497

README.md

@@ -55,6 +55,9 @@ You can use forever to run any kind of script continuously (whether it is writte
     -f, --fifo       Stream logs to stdout
     -n, --number     Number of log lines to print
     --pidFile        The pid file
+    --uid            Process uid, useful as a namespace for processes (must wrap in a string)
+                     eg. forever start "production" app.js
+                         forever stop production
     --sourceDir      The source directory for which SCRIPT is relative to
     --minUptime      Minimum uptime (millis) for a script to not be considered "spinning"
     --spinSleepTime  Time to wait (millis) between launches of a spinning script.
@@ -66,7 +69,7 @@ You can use forever to run any kind of script continuously (whether it is writte
     -w, --watch      Watch for file changes
     --watchDirectory Top-level directory to watch from
     --watchIgnore    To ignore pattern when watch is enabled (multiple option is allowed)
-    --killSignal     Support exit signal customization (default is SIGKILL), 
+    --killSignal     Support exit signal customization (default is SIGKILL),
                      used for restarting script gracefully eg. --killSignal=SIGTERM
     -h, --help       You're staring at it