update changelog
Add -D flag to print timestamps before output lines (like Linux ping).
Fix formatting of usec part of timestamp output.
fix clang warning: comparison of unsigned expression < 0 is always false
Merge pull request #47 from dlad/fix-warning

fix clang warning: comparison of unsigned expression < 0 is always false
Merge branch 'master' of github.com:schweikert/fping
Coverity: remove pointless expression
fix sprint_tm buffer size crash (reported by Japheth Cleaver)
Merge pull request #42 from tohojo/master

Add -D flag to print timestamp in front of output lines.
document new -D flag
Fix compatibility issue with FreeBSD (Alexandre Raynaud, Jason Harris, #39)
Re-create configure script with autoconf 2.69 for aarch64 support (Chuck Anderson, #45)
Release 3.5
Merge fixes