Fix a typo

README.md

@@ -50,7 +50,7 @@ The following SBT settings defined by _sbt-revolver_ are of potential interest:
 
 * `re-start-args`, a `SettingKey[Seq[String]]`, which lets you define arguments that _sbt-revolver_ should pass to your
   application on every start. Any arguments given to the `re-start` task directly will be appended to this setting.
-* `re-start::re-main-class`, which lets you optionally define a main class to run in `re-start` independently of the
+* `re-start::main-class`, which lets you optionally define a main class to run in `re-start` independently of the
   one set for running the project normally. This value defaults to the value of `compile:main-class(for run)`. If you
   don't specify a value here explicitly the same logic as for the normal run main class applies: If only one main class
   is found it one is chosen. Otherwise, the main-class chooser is shown to the user.