Merge pull request #20 from QuantEcon/update-latex

ENH: this updates the latex backend to include cjk

Author: mmcky

.github/workflows/ci.yml

@@ -30,7 +30,8 @@ jobs:
             latexmk                   \
             xindy                     \
             dvipng                    \
-            cm-super
+            cm-super                  \
+            latex-cjk-all
       - name: Display Conda Environment Versions
         shell: bash -l {0}
         run: conda list