README: tweak host dependencies

Signed-off-by: Tianling Shen <cnsztl@immortalwrt.org>
(cherry picked from commit 57192d1)

README.md

@@ -15,7 +15,7 @@ Has access to both ChinaNet & Internet
 ```bash
 sudo apt-get update -y
 sudo apt-get full-upgrade -y
-sudo apt-get install -y build-essential asciidoc binutils bzip2 gawk gettext git libncurses5-dev libz-dev patch unzip zlib1g-dev lib32gcc1 libc6-dev-i386 subversion flex uglifyjs git-core gcc-multilib g++-multilib p7zip p7zip-full msmtp libssl-dev texinfo libreadline-dev libglib2.0-dev xmlto qemu-utils upx libelf-dev autoconf automake libtool autopoint ccache curl wget vim nano python python3 python-pip python3-pip python-ply python3-ply haveged lrzsz device-tree-compiler scons antlr3 gperf intltool rsync
+sudo apt-get install -y build-essential cmake asciidoc binutils bzip2 gawk gettext git libncurses5-dev libz-dev patch unzip zlib1g-dev lib32gcc1 libc6-dev-i386 subversion flex uglifyjs git-core gcc-multilib g++-multilib p7zip p7zip-full msmtp libssl-dev texinfo libreadline-dev libglib2.0-dev xmlto qemu-utils upx libelf-dev autoconf automake libtool autopoint ccache curl wget vim nano python2.7 python3 python3-pip python3-ply haveged lrzsz device-tree-compiler scons antlr3 gperf intltool mkisofs rsync
 ```
 #### For mainland China & Ubuntu(16.04+) user, you may run the following command to setup quickly:
 ```bash