Update git submodules
* Update ChronoSync from branch 'master'
to 5f408ae7f52f2fb792c65db733c80c6d4d5ecf48
- build: align minimum build dependencies with ndn-cxx
* Recommend gcc >= 7.4.0
* Require clang >= 4.0, or Xcode >= 9.0 on macOS
* Silence an ABI-related diagnostic message from gcc on armv7
* Update Travis CI job matrix
Refs: #5087, #5106
Change-Id: I71aef00147a7ad93b537904bb309745fed77f509
diff --git a/ChronoSync b/ChronoSync
index cc6f67c..5f408ae 160000
--- a/ChronoSync
+++ b/ChronoSync
@@ -1 +1 @@
-Subproject commit cc6f67cec9ef196cb776b44cf2a1a3d130385a5d
+Subproject commit 5f408ae7f52f2fb792c65db733c80c6d4d5ecf48