Add a script to install dependencies for plots.

.github/scripts/install-plots-dependencies.bash

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+# A script to install plots dependencies
+
+# Set auxiliary variables
+# for ANSI escape codes
+cyan="\e[1;36m" # Bold cyan
+reset="\e[0m"   # Reset colors
+
+echo -e "\n${cyan}Installing dvipng...${reset}\n"
+sudo apt-get install dvipng
+
+echo -e "\n${cyan}Installing matplotlib...${reset}\n"
+pip3 install matplotlib
+
+echo -e "\n${cyan}Installing texlive-latex-extra...${reset}\n"
+sudo apt-get install texlive-latex-extra
+
+echo -e "\n${cyan}Installing cm-super...${reset}\n"
+sudo apt-get install cm-super

.travis.yml

@@ -20,6 +20,7 @@ jobs:
       arch: amd64
       name: "Documentation Build, Julia 1.4 (Linux, x64)"
       script:
+        - bash .github/scripts/install-plots-dependencies.bash
         - julia --project=docs/ -e 'using Pkg; Pkg.develop(PackageSpec(path=pwd()));
                                                Pkg.instantiate()'
         - julia --project=docs/ docs/make.jl