chore: go mod tidy

go.sum

@@ -1,13 +1,10 @@
-github.com/macrat/go-parallel-pinger v1.0.0 h1:khn5TQ0675xQ3k80Gy7c/T9WT6610YLnLb0tA1bsD7w=
-github.com/macrat/go-parallel-pinger v1.0.0/go.mod h1:s1SWsfXF4LhJmCcnD1P7eTqguyc69yhUzCWDXj8r+VE=
 github.com/macrat/go-parallel-pinger v1.0.1 h1:/iKlcmg4fuGS6D0R/xWpJ5iVVbo8uIjlSN9tA9W1P78=
 github.com/macrat/go-parallel-pinger v1.0.1/go.mod h1:s1SWsfXF4LhJmCcnD1P7eTqguyc69yhUzCWDXj8r+VE=
 github.com/robfig/cron/v3 v3.0.1 h1:WdRxkvbJztn8LMz/QEvLN5sBU+xKpSqwwUO1Pjr4qDs=
 github.com/robfig/cron/v3 v3.0.1/go.mod h1:eQICP3HwyT7UooqI/z+Ov+PtYAWygg1TEWWzGIFLtro=
 golang.org/x/net v0.0.0-20210428140749-89ef3d95e781 h1:DzZ89McO9/gWPsQXS/FVKAlG02ZjaQ6AlZRBimEYOd0=
 golang.org/x/net v0.0.0-20210428140749-89ef3d95e781/go.mod h1:OJAsFXCWl8Ukc7SiCT/9KSuxbyM7479/AVlXFRxuMCk=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210423082822-04245dca01da h1:b3NXsE2LusjYGGjL5bxEVZZORm/YEFFrWFjR8eFrw/c=
 golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210426230700-d19ff857e887 h1:dXfMednGJh/SUUFjTLsWJz3P+TQt9qnR11GgeI3vWKs=
 golang.org/x/sys v0.0.0-20210426230700-d19ff857e887/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=