Update README

README.md

@@ -18,6 +18,11 @@
 ## Using
 By default, dfmt reads its input from ```stdin``` and writes to ```stdout```.
 If a file name is specified on the command line, input will be read from the
-file instead, and output will be written to ```stdout```. If the ```--inplace```
-option is specified a file name is required and the file will be edited
-in-place.
+file instead, and output will be written to ```stdout```.
+#### Options
+* ```--inplace```: a file name is required and the file will be edited in-place.
+* ```--braces=otbs```: Use ["The One True Brace Style"](https://en.wikipedia.org/wiki/Indent_style#Variant:_1TBS), placing open braces on
+  the same line as the previous token.
+* ```--braces=allman```: Use ["Allman Style"](https://en.wikipedia.org/wiki/Indent_style#Allman_style),
+  placing opening braces on their own line. This is the default
+* ```--tabs```: Use tabs for indentation instead of spaces