Clean up broken markdown in README.md

README.md

@@ -38,7 +38,6 @@ Before you can compile `tray`, you'll need to add an environment definition befo
 ```
 
 **For Mac:**
-**For Windows:**
 ```c
 #include <stdio.h>
 #include <string.h>
@@ -49,11 +48,6 @@ Before you can compile `tray`, you'll need to add an environment definition befo
 ...
 ```
 
-// For Linux:
-//#define TRAY_APPINDICATOR 1
-// For Mac:
-//#define TRAY_APPKIT 1
-
 # Demo
 
 The included example `.c` files can be compiled based on your environment.