Fix an UnboundLocalError under Python 2

`email` was not yet there, so I assume you meant `line` :)

This fixes the following error for me:

```
Traceback (most recent call last):
  File "email_validator/__init__.py", line 352, in <module>
    main()
  File "email_validator/__init__.py", line 298, in main
    if sys.version_info < (3,): email = email.decode("utf8") # assume utf8 in input
UnboundLocalError: local variable 'email' referenced before assignment
```

Author: felixonmars

email_validator/__init__.py

@@ -295,7 +295,7 @@ def main():
 			# Strip newlines and skip blank lines and comments.
 			line = line.strip()
 			if line == "" or line[0] == "#": continue
-			if sys.version_info < (3,): email = email.decode("utf8") # assume utf8 in input
+			if sys.version_info < (3,): line = line.decode("utf8") # assume utf8 in input
 
 			# Pick up "[valid]"/"[invalid]" lines.
 			if line == "[valid]":