Query without "limit"

[develhox]

Library version: 0.4.2

Actions to reproduce the bug

Call the SQLiteDatabase.query() method without a limit clause.
For example: SQLiteDatabase.openOrCreateDatabase(path).query(table: tableName)

Expected behaviour

The method returns a cursor with all the rows in the table

Bugged behaviour

The library produces an incorrect SQL query and throws the following exception:
java.lang.IllegalArgumentException: invalid LIMIT clauses:null

Suggested fix

I took a look at the code and I found that the issue is at the line 432 of database.dart. To fix it the line
'limit': limit.toString(),
should be replaced with
'limit': limit?.toString(),

[artob]

Thanks! I've released 0.4.3 which includes this fix.