Update README.md

Author: GorgonMeducer

README.md

@@ -1,4 +1,4 @@
-# perf_counter (v2.3.3)
+# perf_counter (v2.4.0)
 A dedicated performance counter for Cortex-M Systick. It shares the SysTick with users' original SysTick function(s) without interfering with it. This library will bring new functionalities, such as performance counter,` delay_us` and `clock()` service defined in `time.h`.
 
 ### Features:
@@ -45,8 +45,9 @@ A dedicated performance counter for Cortex-M Systick. It shares the SysTick with
     - `foreach()`, dimof(), `CONNECT()`
     - C# like `using()`
     - simple overload feature of OOPC made out of ANSI-C99, `__PLOOC_VA_NUM_ARGS()`
+    - **[new]** add macros for PT
     - ...
-  - **[new]** A dedicated macro `__perfc_sync_barrier__()` for code barrier. 
+  - A dedicated macro `__perfc_sync_barrier__()` for code barrier.