Fix Bulgarian mobile phone number validation

Author: asynchroza

src/lib/isMobilePhone.js

@@ -23,7 +23,7 @@ const phones = {
   'ar-QA': /^(\+?974|0)?([3567]\d{7})$/,
   'bs-BA': /^((((\+|00)3876)|06))((([0-3]|[5-6])\d{6})|(4\d{7}))$/,
   'be-BY': /^(\+?375)?(24|25|29|33|44)\d{7}$/,
-  'bg-BG': /^(\+?359|0)?8[789]\d{7}$/,
+  'bg-BG': /^(\+?359|0)?(8[789]|98)\d{7}$/,
   'bn-BD': /^(\+?880|0)1[13456789][0-9]{8}$/,
   'ca-AD': /^(\+376)?[346]\d{5}$/,
   'cs-CZ': /^(\+?420)? ?[1-9][0-9]{2} ?[0-9]{3} ?[0-9]{3}$/,