Update TypeScript definition

Author: blakeembrey

javascript-stringify.d.ts

@@ -1,3 +1,10 @@
-declare function javascriptStringify (value: any, replacer?: Function, space?: string | number): string;
+declare function stringify (value: any, replacer?: Function, space?: string | number, options?: javascriptStringify.Options): string;
 
-export = javascriptStringify;
+declare namespace javascriptStringify {
+  export interface Options {
+    maxDepth?: number;
+    references?: boolean;
+  }
+}
+
+export = stringify;