Update README.md

Author: DanielHougaard

README.md

@@ -1,7 +1,12 @@
-# Infisical Javascript SDK V2
+# Infisical Node.js SDK
 
 The Infisical SDK provides a convenient way to interact with the Infisical API. 
 
+## Deprecation Notice
+
+Please be aware that all versions prior to `3.0.0` are officially fully unsupported.
+Please upgrade to version 3.0.0 or newer in order to recieve the latest updates. 
+
 ## Installation
 
 ```bash