replace https://github.com/borisyankov/DefinitelyTyped to https://github.com/DefinitelyTyped/DefinitelyTyped

which/which.d.ts

@@ -1,7 +1,7 @@
 // Type definitions for which 1.0.8
 // Project: https://github.com/isaacs/node-which
 // Definitions by: vvakame <https://github.com/vvakame>
-// Definitions: https://github.com/borisyankov/DefinitelyTyped
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
 declare module "which" {
   function when (cmd: string, cb: (err: Error, path: string) => void): void;