added _ in TESTCASE and TESTSUITE
diff --git a/examples/hello_world/main.cpp b/examples/hello_world/main.cpp
index 1888cd3..fbc59af 100644
--- a/examples/hello_world/main.cpp
+++ b/examples/hello_world/main.cpp
@@ -3,6 +3,6 @@
 

 #include <cstdio>

 

-TESTCASE("the only test") {

+TEST_CASE("the only test") {

     printf("Hello world!\n");

 }