fixing typo

docker/Dockerfile

@@ -8,7 +8,7 @@ RUN mkdir /app/ \
     && rm -rf /var/cache/yum \
     && yum clean all \
     && yum install --nogpg -y python34 python34-pip python34-devel readline-devel R wget \
-    && wget https://bioconductor.org/packages/release/bioc/src/contrib/limma_3.36.1.tar.gz
+    && wget https://bioconductor.org/packages/release/bioc/src/contrib/limma_3.36.1.tar.gz \
     && R CMD INSTALL limma_*.tar.gz \
     && rm limma_*.tar.gz
 COPY tests/ /app/tests/