Reapply clang-format.

  $ clang-format -i -style=file \
        $(find  . | egrep '.*\.(h|cpp|inl)$')
diff --git a/include/json/assertions.h b/include/json/assertions.h
index 9bf076f..b722548 100644
--- a/include/json/assertions.h
+++ b/include/json/assertions.h
@@ -6,8 +6,8 @@
 #ifndef CPPTL_JSON_ASSERTIONS_H_INCLUDED
 #define CPPTL_JSON_ASSERTIONS_H_INCLUDED
 
-#include <sstream>
 #include <cstdlib>
+#include <sstream>
 
 #if !defined(JSON_IS_AMALGAMATION)
 #include "config.h"