chore: support Node 15

Author: ehmicky

.github/workflows/workflow.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macOS-latest, windows-latest]
-        node-version: [8.17.0, 14.x]
+        node-version: [8.17.0, 15.x]
         exclude:
           - os: macOS-latest
             node-version: 8.17.0
@@ -31,7 +31,7 @@ jobs:
         run: npm ci
       - name: Linting
         run: npm run format:ci
-        if: "${{ matrix.node-version == '14.x' }}"
+        if: "${{ matrix.node-version == '15.x' }}"
       - name: Tests
         run: npm run test:ci
       - name: Get test coverage flags
@@ -48,4 +48,4 @@ jobs:
           flags: ${{ steps.test-coverage-flags.outputs.os }},${{ steps.test-coverage-flags.outputs.node }}
       - name: Build
         run: npm run build
-        if: "${{ matrix.node-version == '14.x' }}"
+        if: "${{ matrix.node-version == '15.x' }}"