psync: Update to the latest version in git

Change-Id: I97024b94a8ae9e989009e71fb8baeee9c4bd5b1e
diff --git a/libpsync/debian/control b/libpsync/debian/control
index 7670401..d7fce44 100644
--- a/libpsync/debian/control
+++ b/libpsync/debian/control
@@ -2,9 +2,9 @@
 Priority: optional
 Maintainer: Ashlesh Gawande <agawande@memphis.edu>
 Build-Depends: debhelper (>= 8.0.0),
- python (>= 2.7.0),
+ python3 (>= 3.5.0),
  pkg-config (>= 0.26),
- python-sphinx (>= 1.1.3),
+ python3-sphinx (>= 1.1.3),
  libboost-all-dev (>= 1.53.0),
  libndn-cxx-dev (>= 0.7.0),
  git