Add vk bridge (#1372)

* Add vk bridge

* Vk bridge attachments

* Vk bridge forwarded messages

* Vk bridge sample config and code cleanup

* Vk bridge add vendor

* Vk bridge message edit

* Vk bridge: fix fetching names of other bots

* Vk bridge: code cleanup

* Vk bridge: fix shadows declaration

* Vk bridge: remove UseFileURL

vendor/github.com/SevereCloud/vksdk/v2/api/stats.go

@@ -0,0 +1,35 @@
+package api // import "github.com/SevereCloud/vksdk/v2/api"
+
+import (
+	"github.com/SevereCloud/vksdk/v2/object"
+)
+
+// StatsGetResponse struct.
+type StatsGetResponse []object.StatsPeriod
+
+// StatsGet returns statistics of a community or an application.
+//
+// https://vk.com/dev/stats.get
+func (vk *VK) StatsGet(params Params) (response StatsGetResponse, err error) {
+	err = vk.RequestUnmarshal("stats.get", &response, params)
+	return
+}
+
+// StatsGetPostReachResponse struct.
+type StatsGetPostReachResponse []object.StatsWallpostStat
+
+// StatsGetPostReach returns stats for a wall post.
+//
+// https://vk.com/dev/stats.getPostReach
+func (vk *VK) StatsGetPostReach(params Params) (response StatsGetPostReachResponse, err error) {
+	err = vk.RequestUnmarshal("stats.getPostReach", &response, params)
+	return
+}
+
+// StatsTrackVisitor adds current session's data in the application statistics.
+//
+// https://vk.com/dev/stats.trackVisitor
+func (vk *VK) StatsTrackVisitor(params Params) (response int, err error) {
+	err = vk.RequestUnmarshal("stats.trackVisitor", &response, params)
+	return
+}