Moved gsm_constants file to include directory
diff --git a/lib/receiver/viterbi_detector.cc b/lib/receiver/viterbi_detector.cc
index 4e8fb3a..3dce379 100644
--- a/lib/receiver/viterbi_detector.cc
+++ b/lib/receiver/viterbi_detector.cc
@@ -56,7 +56,7 @@
  */
 
 #include <gnuradio/gr_complex.h>
-#include <gsm_constants.h>
+#include <grgsm/gsm_constants.h>
 #include <cmath>
 
 #define PATHS_NUM (1 << (CHAN_IMP_RESP_LENGTH-1))