Changed all .hpp extensions to .h where there is now a corresponding .cpp

include/internal/catch_test_case_info.cpp

@@ -8,7 +8,7 @@
 
 #include "catch_test_case_info.h"
 #include "catch_enforce.h"
-#include "catch_test_spec.hpp"
+#include "catch_test_spec.h"
 #include "catch_interfaces_testcase.h"
 #include "catch_string_manip.h"