fix include (#46)

lgarithm · web-flow · commit 9e41e4bd4505 · 2019-07-21T11:46:09.000+08:00
diff --git a/include/ttl/range b/include/ttl/range
@@ -1,5 +1,7 @@
 // # -*- mode: c++ -*-
 #pragma once
+#include <array>
+#include <cstdint>
 
 #include <ttl/bits/std_range.hpp>
 
