hikey: Fix README about kernel version

Change-Id: Ia61aab7324d72e14f472274ede23c67ad8cdda53
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>
diff --git a/README b/README
index b4c97c6..034d0ae 100644
--- a/README
+++ b/README
@@ -39,7 +39,7 @@
 * Building kernel
 $ git clone https://android.googlesource.com/kernel/hikey-linaro
 $ cd hikey-linaro
-$ git checkout -b android-hikey-linaro-4.1 origin/android-hikey-linaro-4.1
+$ git checkout -b android-hikey-linaro-4.4 origin/android-hikey-linaro-4.4
 $ make ARCH=arm64 hikey_defconfig
 $ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-android- -j24
 Output: arch/arm64/boot/Image & arch/arm64/boot/dts/hisilicon/hi6220-hikey.dtb