Update README to use additional-file-patterns

Author: drwl

README.rdoc

@@ -163,7 +163,7 @@ you can do so with a simple environment variable, instead of editing the
 == Options
 
     Usage: annotate [options] [model_file]*
-            --additional_file_patterns   Additional file paths or globs to annotate, separated by commas (e.g. `/foo/bar/%model_name%/*.rb,/baz/%model_name%.rb`)
+            --additional-file-patterns   Additional file paths or globs to annotate, separated by commas (e.g. `/foo/bar/%model_name%/*.rb,/baz/%model_name%.rb`)
         -d, --delete                     Remove annotations from all model files or the routes.rb file
         -p [before|top|after|bottom],    Place the annotations at the top (before) or the bottom (after) of the model/test/fixture/factory/route/serializer file(s)
             --position
@@ -216,10 +216,10 @@ you can do so with a simple environment variable, instead of editing the
             --ignore-unknown-models      don't display warnings for bad model files
             --with-comment               include database comments in model annotations
 
-=== Option: +additional_file_patterns+
+=== Option: +additional-file-patterns+
 
-CLI: +--additional_file_patterns+<br>
-Ruby: +:additional_file_patterns+
+CLI: +--additional-file-patterns+<br>
+Ruby: +:additional-file-patterns+
 
 Provide additional paths for the gem to annotate.  These paths can include globs.
 It is recommended to use absolute paths.  Here are some examples: