ci: remove Gitter workflow, swap nyc for c8 coverage

.github/workflows/test.yml

@@ -43,7 +43,7 @@ jobs:
     strategy:
       matrix:
         os: ['ubuntu-latest', 'windows-latest']
-        node: ['12.0', '14.0', '16.0']
+        node: ['14.14.0', '16.0', '18.0', '20.0']
     name: Testing Node ${{ matrix.node }} on ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v3
@@ -54,10 +54,10 @@ jobs:
 
       - run: npm install
       - run: npm test
-      - if: matrix.os == 'ubuntu-latest' && matrix.node == '16.0'
+      - if: matrix.os == 'ubuntu-latest' && matrix.node == '20.0'
         run: npm run coverage
-      - if: matrix.os == 'ubuntu-latest' && matrix.node == '16.0'
-        uses: coverallsapp/github-action@1.1.3
+      - if: matrix.os == 'ubuntu-latest' && matrix.node == '20.0'
+        uses: coverallsapp/github-action@v2
         with:
-          github-token: ${{ github.token }}
-          path-to-lcov: ./coverage.info
+          file: ./coverage.info
+          format: lcov

.gitignore

@@ -2,8 +2,9 @@ npm-debug.log*
 .npm
 *.tgz
 .eslintcache
-.nyc_output
+coverage
 coverage.info
 test/fixtures/*/build
 node_modules
-lib/*.*js
+lib
+!lib/*.d.ts

.prettierignore

@@ -1,2 +1,4 @@
 test/fixtures/**
-.nyc_output/**
+coverage/**
+package-lock.json
+lib