remove fullDesc from README example

Author: exaexa

README.md

@@ -113,8 +113,7 @@ main :: IO ()
 main = greet =<< execParser opts
   where
     opts = info (sample <**> helper)
-      ( fullDesc
-     <> progDesc "Print a greeting for TARGET"
+      ( progDesc "Print a greeting for TARGET"
      <> header "hello - a test for optparse-applicative" )
 
 greet :: Sample -> IO ()