Update README.md

README.md

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+**Unmaintained**: (2018-11-22) 2co has recently changed their API, and the new API is very different and vast. I don't need most of the things in the API, so it doesn't make sense for me to maintain a SDK for their API. While the code here works as of today, the API itself only works partially, and expect the API to be EOL'd soon.
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 2co-client
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@@ -114,4 +117,4 @@ Checks if the return data from the purchase process by 2checkout is valid. You m
 
 ## License
 
-MIT
+MIT