Merge pull request #14 from thunfischbrot/patch-2

Update usage.md for typo in -D (input -> output)

Author: shenwei356

doc/docs/usage.md

@@ -128,7 +128,7 @@ Flags:
   -l, --lazy-quotes            if given, a quote may appear in an unquoted field and a non-doubled quote may appear in a quoted field
   -H, --no-header-row          specifies that the input CSV file does not have header row
   -j, --num-cpus int           number of CPUs to use (default value depends on your computer) (default 4)
-  -D, --out-delimiter string   delimiting character of the input CSV file (default ",")
+  -D, --out-delimiter string   delimiting character of the output CSV file (default ",")
   -o, --out-file string        out file ("-" for stdout, suffix .gz for gzipped out) (default "-")
   -T, --out-tabs               specifies that the output is delimited with tabs. Overrides "-D"
   -t, --tabs                   specifies that the input CSV file is delimited with tabs. Overrides "-d"