Add Required<T> to lib.d.ts
Add Required<T> to lib.d.ts

donaldpipowitch/TypeScript,kitsonk/TypeScript,SaschaNaz/TypeScript,RyanCavanaugh/TypeScript,nojvek/TypeScript,microsoft/TypeScript,SaschaNaz/TypeScript,basarat/TypeScript,minestarks/TypeScript,Microsoft/TypeScript,nojvek/TypeScript,donaldpipowitch/TypeScript,minestarks/TypeScript,minestarks/TypeScript,weswigham/TypeScript,SaschaNaz/TypeScript,SaschaNaz/TypeScript,weswigham/TypeScript,kitsonk/TypeScript,donaldpipowitch/TypeScript,kpreisser/TypeScript,basarat/TypeScript,kpreisser/TypeScript,Microsoft/TypeScript,alexeagle/TypeScript,Microsoft/TypeScript,basarat/TypeScript,alexeagle/TypeScript,microsoft/TypeScript,nojvek/TypeScript,RyanCavanaugh/TypeScript,weswigham/TypeScript,alexeagle/TypeScript,basarat/TypeScript,kpreisser/TypeScript,kitsonk/TypeScript,nojvek/TypeScript,microsoft/TypeScript,RyanCavanaugh/TypeScript,donaldpipowitch/TypeScript