add github actions pkgdown deployment

.github/workflows/pkgdown.yaml

@@ -0,0 +1,44 @@
+on:
+  push:
+    branches: master
+
+name: pkgdown
+
+jobs:
+  pkgdown:
+    runs-on: macOS-latest
+    env:
+      GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: r-lib/actions/setup-r@master
+
+      - uses: r-lib/actions/setup-pandoc@master
+
+      - name: Query dependencies
+        run: |
+          install.packages('remotes')
+          saveRDS(remotes::dev_package_deps(dependencies = TRUE), ".github/depends.Rds", version = 2)
+        shell: Rscript {0}
+
+      - name: Cache R packages
+        uses: actions/cache@v1
+        with:
+          path: ${{ env.R_LIBS_USER }}
+          key: macOS-r-4.0-1-${{ hashFiles('.github/depends.Rds') }}
+          restore-keys: macOS-r-4.0-1-
+
+      - name: Install dependencies
+        run: |
+          install.packages(c("remotes", "pkgbuild"))
+          remotes::install_deps(dependencies = TRUE)
+          remotes::install_dev("pkgdown")
+        shell: Rscript {0}
+
+      - name: Install package
+        run: R CMD INSTALL .
+
+      - name: Deploy package
+        run: pkgdown::deploy_to_branch(new_process = FALSE)
+        shell: Rscript {0}

CRAN-RELEASE

@@ -0,0 +1,2 @@
+This package was submitted to CRAN on 2020-06-10.
+Once it is accepted, delete this file and tag the release (commit b842c0d562).