Bump version to 4.0.1-rc.

Author: DanielRosenwasser

package.json

@@ -2,7 +2,7 @@
     "name": "typescript",
     "author": "Microsoft Corp.",
     "homepage": "https://www.typescriptlang.org/",
-    "version": "4.0.0-beta",
+    "version": "4.0.1-rc",
     "license": "Apache-2.0",
     "description": "TypeScript is a language for application scale JavaScript development",
     "keywords": [

src/compiler/corePublic.ts

@@ -3,7 +3,7 @@ namespace ts {
     // If changing the text in this section, be sure to test `configurePrerelease` too.
     export const versionMajorMinor = "4.0";
     /** The version of the TypeScript compiler release */
-    export const version = `${versionMajorMinor}.0-beta`;
+    export const version = `${versionMajorMinor}.1-rc`;
 
     /**
      * Type of objects whose values are all of the same type.