libchronosync: Update to version 0.5.1

Change-Id: I7f7c58d3289184cd5303514ea18500337ed1506a
diff --git a/libchronosync/debian/control b/libchronosync/debian/control
index 60412d8..27fc1d6 100644
--- a/libchronosync/debian/control
+++ b/libchronosync/debian/control
@@ -6,7 +6,8 @@
  pkg-config (>= 0.26),
  python-sphinx (>= 1.1.3),
  libboost-all-dev (>= 1.53.0),
- libndn-cxx-dev (>= 0.6.1)
+ libndn-cxx-dev (>= 0.6.2),
+ git
 Standards-Version: 3.9.2
 Section: libs
 Homepage: http://named-data.net/doc/ChronoSync/