Added command to install squashfs-tools in README.md

Signed-off-by: Dilip Renkila <[email protected]>

Author: diliprenkila

README.md

@@ -90,7 +90,7 @@ backend. Installing these tools adds a bit to initramfs and may slow down your
 host boot, but are needed if you'd like to use a particular backend:
 
     sudo apt-get install lvm2 thin-provisioning-tools
-    sudo apt-get install btrfs-tools
+    sudo apt-get install btrfs-tools squashfs-tools
 
 To run the testsuite, you'll also need:
 

scripts/vagrant/install-lxd.sh

@@ -9,7 +9,7 @@ sudo apt-get -y install xz-utils tar acl curl gettext \
 
 # install build dependencies
 sudo apt-get -y install lxc lxc-dev mercurial git pkg-config \
-    protobuf-compiler golang-goprotobuf-dev
+    protobuf-compiler golang-goprotobuf-dev squashfs-tools
 
 # setup env 
 [ -e uid_gid_setup ] || \