New deps.

go.mod

@@ -17,6 +17,8 @@ require (
 	github.com/prometheus/common v0.9.1
 	github.com/tinode/jsonco v1.0.0
 	github.com/tinode/snowflake v1.0.0
+	github.com/ttacon/builder v0.0.0-20170518171403-c099f663e1c2 // indirect
+	github.com/ttacon/libphonenumber v1.1.0
 	go.mongodb.org/mongo-driver v1.3.1
 	golang.org/x/crypto v0.0.0-20200320181102-891825fb96df
 	golang.org/x/net v0.0.0-20200320220750-118fecf932d8

go.sum

@@ -187,6 +187,10 @@ github.com/tinode/jsonco v1.0.0 h1:zVcpjzDvjuA1G+HLrckI5EiiRyq9jgV3x37OQl6e5FE=
 github.com/tinode/jsonco v1.0.0/go.mod h1:Bnavu3302Qfn2pILMNwASkelodgeew3IvDrbdzU84u8=
 github.com/tinode/snowflake v1.0.0 h1:YciQ9ZKn1TrnvpS8yZErt044XJaxWVtR9aMO9rOZVOE=
 github.com/tinode/snowflake v1.0.0/go.mod h1:5JiaCe3o7QdDeyRcAeZBGVghwRS+ygt2CF/hxmAoptQ=
+github.com/ttacon/builder v0.0.0-20170518171403-c099f663e1c2 h1:5u+EJUQiosu3JFX0XS0qTf5FznsMOzTjGqavBGuCbo0=
+github.com/ttacon/builder v0.0.0-20170518171403-c099f663e1c2/go.mod h1:4kyMkleCiLkgY6z8gK5BkI01ChBtxR0ro3I1ZDcGM3w=
+github.com/ttacon/libphonenumber v1.1.0 h1:tC6kE4t8UI4OqQVQjW5q8gSWhG2wnY5moEpSEORdYm4=
+github.com/ttacon/libphonenumber v1.1.0/go.mod h1:E0TpmdVMq5dyVlQ7oenAkhsLu86OkUl+yR4OAxyEg/M=
 github.com/xdg/scram v0.0.0-20180814205039-7eeb5667e42c h1:u40Z8hqBAAQyv+vATcGgV0YCnDjqSL7/q/JyPhhJSPk=
 github.com/xdg/scram v0.0.0-20180814205039-7eeb5667e42c/go.mod h1:lB8K/P019DLNhemzwFU4jHLhdvlE6uDZjXFejJXr49I=
 github.com/xdg/stringprep v0.0.0-20180714160509-73f8eece6fdc h1:n+nNi93yXLkJvKwXNP9d55HC7lGK4H/SRcwB5IaUZLo=