Update usage info in README

Author: Andrew Carter

README.md

@@ -17,15 +17,19 @@ Or using package manager `brew` on OS X
 
 ## Usage
 
-	gotags [options] file(s)
-
-	-L="": source file names are read from the specified file. If file is "-", input is read from standard in.
-	-R=false: recurse into directories in the file list.
-	-f="": write output to specified file. If file is "-", output is written to standard out.
-	-silent=false: do not produce any output on error.
-	-sort=true: sort tags.
-	-tag-relative=false: file paths should be relative to the directory containing the tag file.
-	-v=false: print version.
+    gotags [options] file(s)
+
+      -L="": source file names are read from the specified file. If file is "-", input is read from standard in.
+      -R=false: recurse into directories in the file list.
+      -exclude=[]: exclude files and directories matching 'pattern'. May be called multiple times.
+      -f="": write output to specified file. If file is "-", output is written to standard out.
+      -fields="": include selected extension fields (only +l).
+      -list-languages=false: list supported languages.
+      -silent=false: do not produce any output on error.
+      -sort=true: sort tags.
+      -tag-relative=false: file paths should be relative to the directory containing the tag file.
+      -v=false: print version.
+
 
 ## Vim [Tagbar][] configuration