Bump csslint

Adds "identifier" to checkstyle output, which we can use to generate a
more friendly check name on our side.

codeclimate/csslint@e8b8855

Author: pbrisbin

Dockerfile

@@ -8,7 +8,7 @@ RUN apk --update add nodejs git ruby ruby-dev ruby-bundler less ruby-nokogiri bu
     bundle install -j 4 && \
     apk del build-base && rm -fr /usr/share/ri
 
-RUN npm install -g codeclimate/csslint.git#27a21742
+RUN npm install -g codeclimate/csslint.git#43d315c2
 
 RUN adduser -u 9000 -D app
 USER app