Use latest vhost-gen version

cytopia · cytopia · commit 1d4dc20403db · 2018-06-23T19:21:34.000+02:00
diff --git a/Dockerfile b/Dockerfile
@@ -5,7 +5,7 @@ MAINTAINER "cytopia" <cytopia@everythingcli.org>
 ###
 ### Build arguments
 ###
-ARG VHOST_GEN_GIT_REF=0.6
+ARG VHOST_GEN_GIT_REF=0.7
 ARG CERT_GEN_GIT_REF=0.2
 
 ENV BUILD_DEPS \
