Update README image

Author: alvinng4

.github/c_traceback.png

@@ -3,7 +3,7 @@ A colorful, lightweight error-propagation framework for C.
 
 Documentation Website: [https://www.ctraceback.com](https://www.ctraceback.com)
 
-![C Traceback](.github/compilation_info.png)
+![C Traceback](.github/c_traceback.png)
 
 ## Features
 * Beautiful tracebacks

.github/compilation_info.png

@@ -13,6 +13,12 @@ int main(void)
     ctb_clear_context();
     ctb_install_signal_handler();
 
+    LOG_WARNING(
+        CTB_DEPRECATION_WARNING,
+        "This function is deprecated and will be replaced in the next version"
+    );
+    LOG_MESSAGE("Hello, world!");
+
     double *vec = malloc(N * sizeof(double));
     if (!vec)
     {