Update readme

README.md

@@ -37,10 +37,10 @@ A compact C finite state machine (FSM) implementation that's easy to use on embe
 - [No heap usage](#no-heap-usage)
 - [CentrifugeTest example](#centrifugetest-example)
 - [Multithread safety](#multithread-safety)
+- [Star History](#star-history)
 - [Conclusion](#conclusion)
 - [References](#references)
 
-
 # Preface
 
 Originally published on CodeProject at: <a href="https://www.codeproject.com/Articles/1275479/State-Machine-Design-in-C"><strong>State Machine Design in C</strong></a>
@@ -794,6 +794,12 @@ GUARD_DEFINE(StartTest, NoEventData)
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 </ul>
 
+# Star History
+
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+[![Star History Chart](https://api.star-history.com/svg?repos=endurodave/C_StateMachine&type=Date)](https://star-history.com/#endurodave/C_StateMachine&Date)
+
 # Conclusion
 
 <p>Implementing a state machine using this method as opposed to the old switch statement style may seem like extra effort. However, the payoff is in a more robust design that is capable of being employed uniformly over an entire multithreaded system. Having each state in its own function provides easier reading than a single huge <code>switch</code> statement, and allows unique event data to be sent to each state. In addition, validating state transitions prevents client misuse by eliminating the side effects caused by unwanted state transitions.</p>