Fix typo

README.md

@@ -124,7 +124,7 @@ cd shadowsocks-libev
 sudo apt-get install --no-install-recommends build-essential autoconf libtool libssl-dev \
     gawk debhelper dh-systemd init-system-helpers pkg-config asciidoc xmlto apg libpcre3-dev zlib1g-dev \
     libev-dev libudns-dev libsodium-dev
-./autorun.sh && dpkg-buildpackage -b -us -uc -i
+./autogen.sh && dpkg-buildpackage -b -us -uc -i
 cd ..
 sudo dpkg -i shadowsocks-libev*.deb
 ```