Update Checkers.cs

* Changing checkers versioning back because still going to be one or more updates for 1.8

Source/assembly/Checkers.cs

@@ -65,7 +65,7 @@ public static bool IsCompatible()
             // can expect a future update to be available.
             //
 			if (Versioning.version_major != 1
-				|| Versioning.version_minor != 9) {
+				|| Versioning.version_minor != 8) {
 				return false;
 			}