List 'lock' command in man page

manpages/rebar3.1

@@ -194,6 +194,9 @@ Create new project from templates.
 .IP
 \fI--force\fR: overwrite existing files
 .TP
+\fBlock\fR 
+Lock dependencies.
+.TP
 \fBpath\fR [\fI--app\fR] [\fI--base\fR] [\fI--bin\fR] [\fI--ebin\fR] [\fI--lib\fR] [\fI--priv\fR] [\fI-s\fR|\fI--separator\fR] [\fI--src\fR] [\fI--rel\fR] 
 Print paths to build dirs in current profile.
 .IP