feat(isMobilePhone): add Ethiopia (et-ET) phone number regex

Author: Sagar141005

src/lib/isMobilePhone.js

@@ -93,6 +93,7 @@ const phones = {
   'es-SV': /^(\+?503)?[67]\d{7}$/,
   'es-UY': /^(\+598|0)9[1-9][\d]{6}$/,
   'es-VE': /^(\+?58)?(2|4)\d{9}$/,
+  'et-ET': /^(\+?251|0)(9|7)\d{8}$/,
   'et-EE': /^(\+?372)?\s?(5|8[1-4])\s?([0-9]\s?){6,7}$/,
   'fa-IR': /^(\+?98[\-\s]?|0)9[0-39]\d[\-\s]?\d{3}[\-\s]?\d{4}$/,
   'fi-FI': /^(\+?358|0)\s?(4[0-6]|50)\s?(\d\s?){4,8}$/,