replace yarn with npm

Author: pdziewa

.github/workflows/ci.yml

@@ -23,4 +23,4 @@ jobs:
         uses: bahmutov/npm-install@v1
 
       - name: Test package
-        run: yarn test
+        run: npm run test

.husky/pre-commit

@@ -1 +1 @@
-yarn lint
+npm run lint

.husky/pre-push

@@ -1 +1 @@
-yarn test
+npm run test