public String getVersion() {
		return Tool.VERSION;
	}
ANTLR tool should check output templates / target are compatible with tool code generation.
 For now, a simple string match used on x.y of x.y.z scheme. We use a method to avoid mismatches
 between a template called VERSION. This value is checked against Tool.VERSION during load of templates.

 This additional method forces all targets 4.3 and beyond to add this method.

@since 4.3
tool/src/org/antlr/v4/codegen/Target.java