Fixed missing yarn in Travis
Fixed missing yarn in Travis

supremainc/sfmdev,dockerin/mkdocs-material,dockerin/mkdocs-material,DatanestIO/mkdocs-material,mjames-upc/mkdocs-unidata,DatanestIO/mkdocs-material,squidfunk/mkdocs-material,squidfunk/mkdocs-material,squidfunk/mkdocs-material,DatanestIO/mkdocs-material,mjames-upc/mkdocs-unidata,supremainc/sfmdev,dockerin/mkdocs-material,supremainc/sfmdev,DatanestIO/mkdocs-material,mjames-upc/mkdocs-unidata,supremainc/sfmdev,dockerin/mkdocs-material,squidfunk/mkdocs-material,mjames-upc/mkdocs-unidata