#3 Update PanDoc to 3.1

Dockerfile

@@ -17,7 +17,7 @@ RUN echo "Adding system components" && \
                 libgtk-3-0 libnspr4 libnss3 libpango-1.0-0 libpangocairo-1.0-0 libstdc++6 libx11-6 libx11-xcb1 \
                 libxcb1 libxcomposite1 libxcursor1 libxdamage1 libxext6 libxfixes3 libxi6 libxrandr2 libxrender1 \
                 libxss1 libxtst6 lsb-release wget xdg-utils && \
-    curl -L -o pandoc.deb https://github.com/jgm/pandoc/releases/download/2.19.2/pandoc-2.19.2-1-amd64.deb && \
+    curl -L -o pandoc.deb https://github.com/jgm/pandoc/releases/download/3.1/pandoc-3.1-1-amd64.deb && \
     dpkg -i pandoc.deb && \
     rm pandoc.deb