Merge pull request #242 from topfreegames/feature/add-warning-of-depr…

…ecated-version-at-readme-file

Adding warning of deprecated version at readme file

README.md

@@ -1,5 +1,9 @@
 # pitaya [![Build Status][7]][8] [![Coverage Status][9]][10] [![GoDoc][1]][2] [![Docs][11]][12] [![Go Report Card][3]][4] [![MIT licensed][5]][6]
 
+*WARNING*: The [version v1.x](https://github.com/topfreegames/pitaya/tree/v1) of pitaya is under deprecation, complete guide of the new version v2.x can be found [here](https://github.com/topfreegames/pitaya/issues/240).
+
+---
+
 [1]: https://godoc.org/github.com/topfreegames/pitaya?status.svg
 [2]: https://godoc.org/github.com/topfreegames/pitaya
 [3]: https://goreportcard.com/badge/github.com/topfreegames/pitaya