test: ignore vendor.js coverage

Author: antongolub

package.json

@@ -48,7 +48,7 @@
     "build:dts": "tsc --project tsconfig.prod.json && node scripts/build-dts.mjs",
     "test": "npm run build && node ./test/all.test.js",
     "test:types": "tsd",
-    "coverage": "c8 --check-coverage npm test",
+    "coverage": "c8 -x build/vendor.js --check-coverage npm test",
     "mutation": "stryker run",
     "circular": "madge --circular src/*",
     "version": "cat package.json | fx .version"