Rename .h header files to .hpp

Majority of the project uses .hpp and .h shouldn't be used for C++
header files anyway.

Change-Id: I979ba2d243f8f5dbf45c37237ac4aaf9a733eba8
diff --git a/tests/list_manipulation.cpp b/tests/list_manipulation.cpp
index 5100c61..b71ee7b 100644
--- a/tests/list_manipulation.cpp
+++ b/tests/list_manipulation.cpp
@@ -5,7 +5,7 @@
  *
 */
 
-#include "trompeloeil_doctest.h"
+#include "trompeloeil_doctest.hpp"
 #include "parser.hpp"
 #include "static_schema.hpp"