Update version to v6.2.0

sugyan · sugyan · commit 6bfb87d2637a · 2019-04-04T13:49:10.000+09:00
diff --git a/linebot/version.go b/linebot/version.go
@@ -16,4 +16,4 @@
 
 package linebot
 
-const version = "6.1.0"
+const version = "6.2.0"
