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/parser_methods.cpp b/tests/parser_methods.cpp
index 2a84428..bd53a24 100644
--- a/tests/parser_methods.cpp
+++ b/tests/parser_methods.cpp
@@ -7,7 +7,7 @@
 */
 
 #include <experimental/iterator>
-#include "trompeloeil_doctest.h"
+#include "trompeloeil_doctest.hpp"
 #include "ast_commands.hpp"
 #include "parser.hpp"
 #include "static_schema.hpp"