migrate yarn to 2

.gitignore

@@ -1,2 +1,10 @@
 node_modules
 dist
+
+# yarn
+.yarn/*
+!.yarn/patches
+!.yarn/plugins
+!.yarn/releases
+!.yarn/sdks
+!.yarn/versions

.yarnrc.yml

@@ -0,0 +1,3 @@
+nodeLinker: node-modules
+
+yarnPath: .yarn/releases/yarn-3.2.1.cjs

package.json

@@ -24,5 +24,6 @@
     "typescript": "^3.8.3",
     "webpack": "^4.42.0",
     "webpack-cli": "^3.3.11"
-  }
+  },
+  "packageManager": "yarn@3.2.1"
 }