Merge pull request #857 from IndrajeetPatil/gha_minor

update GHA

Author: lorenzwalthert

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

@@ -27,9 +27,10 @@ jobs:
       matrix:
         config:
           - {os: macOS-latest,   r: 'release'}
+          - {os: windows-latest, r: 'devel'}
           - {os: windows-latest, r: 'release'}
-          - {os: windows-latest, r: '3.6', rspm: "https://packagemanager.rstudio.com/cran/latest"}
-          - {os: ubuntu-18.04,   r: 'devel', rspm: "https://packagemanager.rstudio.com/cran/__linux__/bionic/latest", http-user-agent: "R/4.0.0 (ubuntu-18.04) R (4.0.0 x86_64-pc-linux-gnu x86_64 linux-gnu) on GitHub Actions" }
+          - {os: windows-latest, r: '3.6',     rspm: "https://packagemanager.rstudio.com/cran/latest"}
+          - {os: ubuntu-18.04,   r: 'devel',   rspm: "https://packagemanager.rstudio.com/cran/__linux__/bionic/latest", http-user-agent: "R/4.0.0 (ubuntu-18.04) R (4.0.0 x86_64-pc-linux-gnu x86_64 linux-gnu) on GitHub Actions" }
           - {os: ubuntu-18.04,   r: 'release', rspm: "https://packagemanager.rstudio.com/cran/__linux__/bionic/latest"}
           - {os: ubuntu-18.04,   r: 'oldrel',  rspm: "https://packagemanager.rstudio.com/cran/__linux__/bionic/latest"}
           - {os: ubuntu-18.04,   r: '3.6',     rspm: "https://packagemanager.rstudio.com/cran/__linux__/bionic/latest"}