doc: updated README

README.md

@@ -178,7 +178,7 @@ int main()
 
 | Title              | UML | Source file |
 | ------------------ | --- | ----------- |
-| entry/exit actions | ![entry_exit_actions](http://www.plantuml.com/plantuml/proxy?cache=no&src=https://raw.githubusercontent.com/jfayot/dynamic-state-machine/master/resources/entry_exit_actions.puml) | [transition_action.cpp](./examples/transition_action.cpp) |
+| entry/exit actions | ![entry_exit_actions](http://www.plantuml.com/plantuml/proxy?cache=no&src=https://raw.githubusercontent.com/jfayot/dynamic-state-machine/master/resources/entry_exit_actions.puml) | [entry_exit_actions.cpp](./examples/entry_exit_actions.cpp) |
 | transition action  | ![transition_action](http://www.plantuml.com/plantuml/proxy?cache=no&src=https://raw.githubusercontent.com/jfayot/dynamic-state-machine/master/resources/transition_action.puml) | [transition_action.cpp](./examples/transition_action.cpp) |
 | transition guard   | ![transition_guard](http://www.plantuml.com/plantuml/proxy?cache=no&src=https://raw.githubusercontent.com/jfayot/dynamic-state-machine/master/resources/transition_guard.puml) | [transition_guard.cpp](./examples/transition_guard.cpp) |
 | self transition    | ![self_transition](http://www.plantuml.com/plantuml/proxy?cache=no&src=https://raw.githubusercontent.com/jfayot/dynamic-state-machine/master/resources/self_transition.puml) | [self_transition.cpp](./examples/self_transition.cpp) |