Fixed linting errors

types/add-zero/add-zero-tests.ts

@@ -1,3 +1,3 @@
 import addZero from "add-zero";
 
-addZero(5, 2);
+addZero(5, 2);

types/add-zero/index.d.ts

@@ -3,4 +3,4 @@
 // Definitions by: Giles Roadnight <https://github.com/Roaders>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
-export default function addZero(value: any, digits?: number): string;
+export default function addZero(value: string | number, digits?: number): string;

types/add-zero/tsconfig.json

@@ -7,6 +7,7 @@
         "noImplicitAny": true,
         "noImplicitThis": true,
         "strictNullChecks": true,
+        "strictFunctionTypes": true,
         "baseUrl": "../",
         "typeRoots": [
             "../"