Update version to v6.1.0

sugyan · sugyan · commit 4ddb1c55c843 · 2019-03-26T17:35:54.000+09:00
diff --git a/linebot/version.go b/linebot/version.go
@@ -16,4 +16,4 @@
 
 package linebot
 
-const version = "6.0.0"
+const version = "6.1.0"
