Fix reading text files with carriage return symbols

[mozharovsky]

The new pandas-based text reader isn't able to work properly with files that contain carriage return symbols (\r).

It fails with the following error message:

...
  File "pandas/_libs/parsers.pyx", line 847, in pandas._libs.parsers.TextReader.read
  File "pandas/_libs/parsers.pyx", line 874, in pandas._libs.parsers.TextReader._read_low_memory
  File "pandas/_libs/parsers.pyx", line 918, in pandas._libs.parsers.TextReader._read_rows
  File "pandas/_libs/parsers.pyx", line 905, in pandas._libs.parsers.TextReader._tokenize_rows
  File "pandas/_libs/parsers.pyx", line 2042, in pandas._libs.parsers.raise_parser_error
pandas.errors.ParserError: Error tokenizing data. C error: Buffer overflow caught - possible malformed input file.

---

I figured out the pandas uses those symbols as line terminators and this eventually causes the error. Explicitly specifying the lineterminator fixes that issue and everything works fine.

Please, consider this PR as it seems to be a common issue to solve.

[mozharovsky]

Discussed in #622, fixed in #715. Closing the issue. Thanks @lhoestq, it works now! 👍