Fix return type of normalizeEmail function

Author: AJCStriker

package.json

@@ -1,6 +1,6 @@
 {
   "name": "strontium",
-  "version": "2.3.1",
+  "version": "2.3.2",
   "description": "Strontium is a TypeScript toolkit for High Performance API servers built for Production not Projects.",
   "main": "lib/src/index.js",
   "types": "lib/src/index.d.ts",

src/validation/drivers/sanitizers/normalizeEmail.ts

@@ -4,7 +4,7 @@ import NormalizeEmailOptions = ValidatorJS.NormalizeEmailOptions
 
 export const normalizeEmail = (options?: NormalizeEmailOptions) => <I>(
     input: I
-): string | undefined => {
+): string => {
     let normalizedEmail = Validator.normalizeEmail(String(input), options)
     let isValid = Validator.isEmail(String(normalizedEmail))