build: add v14 to the test matrix

PR-URL: #361
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

.github/workflows/push.yml

@@ -19,8 +19,9 @@ jobs:
           - version: 10.x
           - version: 12.x
           - version: 14.x
+          - version: 15.x
             mirror: https://nodejs.org/download/nightly
-          - version: 14.x
+          - version: 15.x
             mirror: https://nodejs.org/download/v8-canary
         os: [ubuntu-latest, macos-latest]
     steps:
@@ -40,19 +41,19 @@ jobs:
           npm install --llnode_build_addon=true --llnode_coverage=true
       - name: run tests
         run: TEST_LLDB_BINARY=`which lldb-3.9` npm run nyc-test-all
-        if: matrix.node.version != '14.x'
+        if: matrix.node.version != '15.x'
       - name: run tests (nightly)
         run: TEST_LLDB_BINARY=`which lldb-3.9` npm run nyc-test-all
-        if: matrix.node.version == '14.x'
+        if: matrix.node.version == '15.x'
         continue-on-error: true
       - name: prepare coverage
-        if: matrix.os == 'ubuntu-latest' && matrix.node.version != '14.x'
+        if: matrix.os == 'ubuntu-latest' && matrix.node.version != '15.x'
         run: |
           npm run coverage
           cat ./coverage-js.info > ./coverage.info
           cat ./coverage-cc.info >> ./coverage.info
       - name: coveralls
-        if: matrix.os == 'ubuntu-latest' && matrix.node.version != '14.x'
+        if: matrix.os == 'ubuntu-latest' && matrix.node.version != '15.x'
         uses: coverallsapp/github-action@master
         with:
           path-to-lcov: ./coverage.info