use gh actions instead of travis/appveyor

.github/workflows/R-check.yml

@@ -0,0 +1,66 @@
+on: [push, pull_request]
+
+name: R-check
+
+jobs:
+  R-check:
+    runs-on: ${{ matrix.config.os }}
+
+    name: ${{ matrix.config.os }} (${{ matrix.config.r }})
+
+    strategy:
+      fail-fast: false
+      matrix:
+        config:
+        - { os: windows-latest, r: 'latest'}
+        - { os: macOS-latest, r: 'latest'}
+        - { os: macOS-latest, r: 'devel'}
+        - { os: ubuntu-16.04, r: '3.6', rspm: "https://packagemanager.rstudio.com/cran/__linux__/xenial/latest"}
+        - { os: ubuntu-16.04, r: 'latest', rspm: "https://packagemanager.rstudio.com/cran/__linux__/xenial/latest"}
+
+    env:
+      R_REMOTES_NO_ERRORS_FROM_WARNINGS: true
+      RSPM: ${{ matrix.config.rspm }}
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: r-lib/actions/setup-r@v1
+        with:
+          r-version: ${{ matrix.config.r }}
+
+      - uses: r-lib/actions/setup-pandoc@v1
+
+      - name: Cache R packages
+        if: runner.os != 'Windows'
+        uses: actions/cache@v2
+        with:
+          path: ${{ env.R_LIBS_USER }}
+          key: ${{ runner.os }}-r-${{ matrix.config.r }}-${{ hashFiles('DESCRIPTION') }}
+
+      - name: Install system dependencies
+        if: runner.os == 'Linux'
+        env:
+          RHUB_PLATFORM: linux-x86_64-ubuntu-gcc
+        run: |
+          Rscript -e "install.packages('remotes')" -e "remotes::install_github('r-hub/sysreqs')"
+          sysreqs=$(Rscript -e "cat(sysreqs::sysreq_commands('DESCRIPTION'))")
+          sudo -s eval "$sysreqs"
+      
+      - name: Install dependencies
+        run: Rscript -e "install.packages('remotes')" -e "remotes::install_deps(dependencies = TRUE)" -e "remotes::install_cran('rcmdcheck')"
+
+      - name: Check
+        run: Rscript -e "rcmdcheck::rcmdcheck(args = '--no-manual', error_on = 'warning', check_dir = 'check')"
+
+      - name: Upload check results
+        if: failure()
+        uses: actions/upload-artifact@v2
+        with:
+          name: ${{ runner.os }}-r${{ matrix.config.r }}-results
+          path: check
+
+      - name: Test coverage
+        if: matrix.config.os == 'macOS-latest' && matrix.config.r == 'latest'
+        run: |
+          Rscript -e 'install.packages("covr")' -e 'covr::codecov(token = "${{secrets.CODECOV_TOKEN}}")'