Add Typescript typings

Josh Woodcock · Josh Woodcock · commit a5a07561db3d · 2020-06-23T07:22:34.000-05:00
diff --git a/index.d.ts b/index.d.ts
@@ -0,0 +1,4 @@
+export interface MessageValidator {
+    encoding: string;
+    validate(hash: any, cb: (err: string, message: string) => any);
+}
