Single quoted literal with alias generates wrong tokens #518

Using version 0.3.0

In a query such as this:

SELECT 'fixed_text' ALIAS1 FROM .......

The tokens generated are:
Token (ttype=Token.Literal.String.Single) = 'fixed_text'
Identifier = ALIAS1

The expected tokens are:
1 Identifier with tokens containing a Single and an Identifier

Expected tokens are generated correctly when the 'AS' keword is used:

SELECT 'fixed_text' AS ALIAS1 FROM .......

If there are many fields in the select list, the behavior remains, but Identifier or IdentifierList tokens are generated before and/or after the Single:

SELECT 'fixed_text' ALIAS1, field1, field2 FROM .......
Will generate 1 Single and 1 IdentifierList, the IdentifierList will contain 3 Identifiers (ALIAS1, field1 and field2)

SELECT field1, field2, 'fixed_text' ALIAS1 FROM .......
Will generate 1 IdentifierList (field1, field2, 1 Single), 1 Identifier (ALIAS1)