README: Document --disable-nanofury configure option

README

@@ -141,6 +141,7 @@ BFGMiner specific configuration options:
 	--disable-bigpic        Compile support for Big Picture Mining USB (default
 	                        enabled)
 	--disable-littlefury    Compile support for LittleFury (default enabled)
+	--disable-nanofury      Compile support for NanoFury (default enabled)
 	--enable-metabank       Compile support for Metabank (default disabled)
 	--disable-bitforce      Compile support for BitForce (default enabled)
 	--disable-icarus        Compile support for Icarus (default enabled)