latest versions

Signed-off-by: Jess Frazelle <acidburn@google.com>

routersploit/Dockerfile

@@ -1,6 +1,8 @@
 FROM debian:sid
 MAINTAINER Christian Koep <christian.koep@fom-net.de>
 
+ENV ROUTERSPLOIT_VERSION v2.2.1
+
 RUN apt-get update && apt-get install -y \
     git \
     python-requests \
@@ -9,7 +11,7 @@ RUN apt-get update && apt-get install -y \
     python-bs4 \
     --no-install-recommends \
     && rm -rf /var/lib/apt/lists/* \
-    && git clone https://github.com/reverse-shell/routersploit /usr/bin/routersploit \
+    && git clone --branch "${ROUTERSPLOIT_VERSION}" https://github.com/reverse-shell/routersploit /usr/bin/routersploit \
     && apt-get purge -y --auto-remove \
     git