diff --git a/.travis.yml b/.travis.yml
index e7f2fd7..6b44263 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,6 @@
 language: go
 go:
+  - '1.8'
   - '1.9'
   - '1.10'
   - '1.11'
diff --git a/README.md b/README.md
index 2a9fc9f..fb2cfcf 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,7 @@
-[![Build Status](https://img.shields.io/travis/retailcrm/mg-bot-api-client-go/master.svg?style=flat-square)](https://travis-ci.org/retailcrm/mg-bot-api-client-go)
+[![Build Status](https://img.shields.io/travis/retailcrm/mg-bot-api-client-go/master.svg?logo=travis&style=flat-square)](https://travis-ci.org/retailcrm/mg-bot-api-client-go)
 [![GitHub release](https://img.shields.io/github/release/retailcrm/mg-bot-api-client-go.svg?style=flat-square)](https://github.com/retailcrm/mg-bot-api-client-go/releases)
-[![GoLang version](https://img.shields.io/badge/GoLang-1.9%2C%201.10%2C%201.11-blue.svg?style=flat-square)](https://golang.org/dl/)
+[![GoLang version](https://img.shields.io/badge/go-1.8%2C%201.9%2C%201.10%2C%201.11-blue.svg?style=flat-square)](https://golang.org/dl/)
+[![Godoc reference](https://img.shields.io/badge/godoc-reference-blue.svg?style=flat-square)](https://godoc.org/github.com/retailcrm/mg-bot-api-client-go)
 
 
 # retailCRM Message Gateway Bot API Go client
@@ -39,7 +40,3 @@ func main() {
     fmt.Printf("%v", data.MessageID)
 }
 ```
-
-## Documentation
-
-* [GoDoc](https://godoc.org/github.com/retailcrm/mg-bot-api-client-go)
diff --git a/v1/types.go b/v1/types.go
index f2b7abb..10edb29 100644
--- a/v1/types.go
+++ b/v1/types.go
@@ -46,11 +46,11 @@ type (
 	}
 
 	ChannelsRequest struct {
-		ID     uint64 `url:"id,omitempty"`
-		Types  string `url:"types,omitempty"`
-		Active uint8  `url:"active,omitempty"`
-		Since  string `url:"since,omitempty"`
-		Until  string `url:"until,omitempty"`
+		ID     uint64   `url:"id,omitempty"`
+		Types  []string `url:"types,omitempty"`
+		Active uint8    `url:"active,omitempty"`
+		Since  string   `url:"since,omitempty"`
+		Until  string   `url:"until,omitempty"`
 	}
 
 	UsersRequest struct {