Prepare @actions/exec 2.0.0 release

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@actions/exec",
-  "version": "1.1.1",
+  "version": "2.0.0",
   "description": "Actions exec lib",
   "keywords": [
     "github",
@@ -36,6 +36,6 @@
     "url": "https://github.com/actions/toolkit/issues"
   },
   "dependencies": {
-    "@actions/io": "^1.0.1"
+    "@actions/io": "^2.0.0"
   }
 }