Use a lower version of node (nodejs6)

Fixes #182

Author: yash-nisar

Dockerfile

@@ -16,8 +16,6 @@ RUN mkdir -p /root/.local/share/coala && \
 
 # Add packaged flawfinder
 RUN zypper addrepo http://download.opensuse.org/repositories/home:illuusio/openSUSE_Tumbleweed/home:illuusio.repo && \
-  # Use Leap for nodejs
-  zypper addrepo http://download.opensuse.org/repositories/devel:languages:nodejs/openSUSE_Leap_42.2/devel:languages:nodejs.repo && \
   # Remove unnecessary repos to avoid refreshes
   zypper removerepo 'NON-OSS' && \
   # Package dependencies
@@ -61,7 +59,7 @@ RUN zypper addrepo http://download.opensuse.org/repositories/home:illuusio/openS
     lua-devel \
     luarocks \
     m4 \
-    nodejs \
+    nodejs6 \
     npm \
     # patch is used by Ruby gem pg_query
     patch \