dep ensure Solve(): No versions of github.com/tatsushid/go-fastping met constraints

[Honghe]

use golang official package manager: dep

dep ensure -add github.com/tatsushid/go-fastping
ensure Solve(): No versions of github.com/tatsushid/go-fastping met constraints:
        master: unable to deduce repository and source type for "golang.org/x/net/icmp": unable to read metadata: un
able to fetch raw metadata: failed HTTP request to URL "http://golang.org/x/net/icmp?go-get=1": Get http://golang.or
g/x/net/icmp?go-get=1: dial tcp 216.239.37.1:80: connectex: A connection attempt failed because the connected party
did not properly respond after a period of time, or established connection failed because connected host has failed
to respond.
        fix/refactor-sendicmp: unable to deduce repository and source type for "golang.org/x/net/icmp": unable to re
ad metadata: unable to fetch raw metadata: failed HTTP request to URL "http://golang.org/x/net/icmp?go-get=1": Get h
ttp://golang.org/x/net/icmp?go-get=1: dial tcp 216.239.37.1:80: connectex: A connection attempt failed because the c
onnected party did not properly respond after a period of time, or established connection failed because connected h
ost has failed to respond.