update BUILD files

vendor/github.com/square/go-jose/BUILD

@@ -15,6 +15,7 @@ go_library(
         "symmetric.go",
         "utils.go",
     ],
+    importpath = "github.com/square/go-jose",
     visibility = ["//visibility:public"],
     deps = [
         "//vendor/github.com/square/go-jose/cipher:go_default_library",

vendor/github.com/square/go-jose/cipher/BUILD

@@ -8,6 +8,7 @@ go_library(
         "ecdh_es.go",
         "key_wrap.go",
     ],
+    importpath = "github.com/square/go-jose/cipher",
     visibility = ["//visibility:public"],
 )
 

vendor/github.com/square/go-jose/json/BUILD

@@ -10,6 +10,7 @@ go_library(
         "stream.go",
         "tags.go",
     ],
+    importpath = "github.com/square/go-jose/json",
     visibility = ["//visibility:public"],
 )