Add missing version tag to DEB links

repo2docker/buildpacks/base.py

@@ -45,8 +45,8 @@ WORKDIR ${HOME}
 
 RUN wget --quiet -O - https://deb.nodesource.com/gpgkey/nodesource.gpg.key |  apt-key add - \
     DISTRO="$(lsb_release -s -c)" \
-    echo "deb https://deb.nodesource.com/$VERSION $DISTRO main" |  tee /etc/apt/sources.list.d/nodesource.list \
-    echo "deb-src https://deb.nodesource.com/$VERSION $DISTRO main" |  tee -a /etc/apt/sources.list.d/nodesource.list 
+    echo "deb https://deb.nodesource.com/node_10.x $DISTRO main" |  tee /etc/apt/sources.list.d/nodesource.list \
+    echo "deb-src https://deb.nodesource.com/node_10.x $DISTRO main" |  tee -a /etc/apt/sources.list.d/nodesource.list
 
 RUN apt-get update && \
     apt-get install --yes --no-install-recommends \
@@ -187,9 +187,7 @@ class BuildPack:
         return {
             # Utils!
             "less",
-
             "nodejs",
-
             "unzip",
         }