README: update about .tar.xz format

[Dave Young]

kernel.org do not provide .bz2 for downloading, see below:
https://www.kernel.org/happy-new-year-and-good-bye-bzip2.html

Thus update README about using xz format.

Signed-off-by: Dave Young <dyoung@xxxxxxxxxx>
---
 README |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- linux.orig/README
+++ linux/README
@@ -66,7 +66,7 @@ INSTALLING the kernel source:
 
    or
 
-     bzip2 -dc linux-3.X.tar.bz2 | tar xvf -
+     xz -dc linux-3.X.tar.xz | tar xvf -
 
    Replace "X" with the version number of the latest kernel.
 
@@ -76,7 +76,7 @@ INSTALLING the kernel source:
    whatever the kernel-du-jour happens to be.
 
  - You can also upgrade between 3.x releases by patching.  Patches are
-   distributed in the traditional gzip and the newer bzip2 format.  To
+   distributed in the traditional gzip and the newer xz format.  To
    install by patching, get all the newer patch files, enter the
    top level directory of the kernel source (linux-3.X) and execute:
 
@@ -84,7 +84,7 @@ INSTALLING the kernel source:
 
    or
 
-     bzip2 -dc ../patch-3.x.bz2 | patch -p1
+     xz -dc ../patch-3.x.xz | patch -p1
 
    Replace "x" for all versions bigger than the version "X" of your current
    source tree, _in_order_, and you should be ok.  You may want to remove
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