add a blank line after #include "unity.h"

The include must be in the first line, else you may expect some issues.
Some autoformat tools could sort the includes alphabetically and could
break the test.

auto/generate_module.rb

@@ -14,6 +14,7 @@ require 'pathname'
 
 # TEMPLATE_TST
 TEMPLATE_TST ||= '#include "unity.h"
+
 %2$s#include "%1$s.h"
 
 void setUp(void)