Added xz decompression rule

src/binwalk/config/extract.conf

@@ -9,6 +9,7 @@
 # Assumes these utilities are installed in $PATH.
 ^gzip compressed data:gz:gzip -d -f '%e'
 ^lzma compressed data:7z:7zr e -y '%e'
+^xz compressed data:tar:tar xJf '%e'
 ^bzip2 compressed data:bz2:bzip2 -d -f '%e'
 ^compress'd data:Z:compress -d '%e'
 ^zip archive data:zip:jar xf '%e' # jar does a better job of unzipping than unzip does...