Update README

README.md

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 # Pointer Lock for Defold
 
+> 💡 Prior to Defold 1.3.7, this extension had C API to lock/unlock mouse cursor. After the release of Defold 1.3.7, the C API was cut and since then the extension has been the demo project of how to implement mouse lock in your Defold game.
+>
+> So, this version of Pointer Lock requires **Defold 1.3.7 or newer**.
+
 Pointer Lock is intended to simplify mouse locking to access mouse events even when the cursor goes past the boundary of the window or screen. For example, a user can continue to rotate or manipulate a 3D model by moving the mouse without end. Without mouse locking, the rotation or manipulation stops the moment the pointer reaches the edge of the window or screen.
 
 If you want to make a first-person 3D game (DOOM-like, Quake-like etc.) with Defold, you need this extension.