scope hei_bit_string.hpp for external use

This header will been needed by user applications.

Signed-off-by: Zane Shelley <zshelle@us.ibm.com>
Change-Id: I4eae57c63e3d314d87faed364a3c314c2300d20a
diff --git a/src/util/hei_bit_string.cpp b/src/util/hei_bit_string.cpp
index a04fb43..9129663 100644
--- a/src/util/hei_bit_string.cpp
+++ b/src/util/hei_bit_string.cpp
@@ -2,8 +2,8 @@
  *  @brief BitString and BitStringBuffer class definitions
  */
 
+#include <hei_bit_string.hpp>
 #include <hei_includes.hpp>
-#include <util/hei_bit_string.hpp>
 
 #include <algorithm>