fix typo

Author: fmichonneau

.github/workflows/R-CMD-check.yaml

@@ -14,7 +14,7 @@ jobs:
       - name: Install tinytex packages
         run: |
           Rscript \
-          -e "install.packages('tinytex')"
+          -e "install.packages('tinytex')" \
           -e "tinytex::tlmgr_install('epstopdf')"
       - name: Check
         run: Rscript -e "rcmdcheck::rcmdcheck(args = '--no-manual', error_on = 'error')"