Fix changelog version parsing

Author: kyb3r

core/changelog.py

@@ -42,7 +42,7 @@ def embed(self):
 class ChangeLog:
 
     changelog_url = 'https://raw.githubusercontent.com/kyb3r/modmail/master/CHANGELOG.md'
-    regex = re.compile(r'# (v\d\.\d\.\d)([\S\s]*?(?=# v))')
+    regex = re.compile(r'# (v\d+\.\d+\.\d+)([\S\s]*?(?=# v))')
 
     def __init__(self, bot, text):
         self.bot = bot