Build failing on Python 3.6

[yorodm]

The current code fails when tested against Python 3.6.

Travis logs says:

def test_goto_definition_finds_line():
            server.workspace.get_document = Mock(return_value=fake_document)
            params = TextDocumentPositionParams(
                TextDocumentIdentifier(fake_document_uri),
                Position(1, 21)
            )
            definition = jump_to_definition(server, params)[0]
            start = definition.range.start
>           assert start.line == 350 and start.character == 6
E           assert (340 == 350)
E            +  where 340 = 340:6.line