update source list

Author: myfreax

Dockerfile

@@ -2,4 +2,5 @@ FROM ubuntu:16.04
 RUN apt-get update && apt-get install -y \
     curl \
  && curl -sL https://deb.nodesource.com/setup_7.x | bash - \
+ && apt-get update  \
  && apt-get install -y nodejs