rflint fails with ImportError: No module named txtreader

[php-coder]

=====> Run robot framework lint

Traceback (most recent call last):
  File "/home/travis/.local/bin/rflint", line 5, in <module>
    from rflint.__main__ import main
  File "/home/travis/.local/lib/python2.7/site-packages/rflint/__init__.py", line 1, in <module>
    from .rflint import RfLint, ERROR, WARNING
  File "/home/travis/.local/lib/python2.7/site-packages/rflint/rflint.py", line 30, in <module>
    from .parser import RobotFactory, SuiteFile, ResourceFile
  File "/home/travis/.local/lib/python2.7/site-packages/rflint/parser/__init__.py", line 1, in <module>
    from .parser import (SuiteFolder, ResourceFile, SuiteFile, RobotFactory, 
  File "/home/travis/.local/lib/python2.7/site-packages/rflint/parser/parser.py", line 24, in <module>
    from robot.parsing.txtreader import TxtReader
ImportError: No module named txtreader

See there: https://travis-ci.org/github/php-coder/mystamps/jobs/690186467

[php-coder]

Upstream issue: boakley/robotframework-lint#73

[php-coder]

It seems like rflint 1.1 was released recently: https://pypi.org/project/robotframework-lint/1.1/

[php-coder]

With rflint 1.1 the build is broken again:

Traceback (most recent call last):
387  File "/home/travis/.local/bin/rflint", line 5, in <module>
388    from rflint.__main__ import main
389  File "/home/travis/.local/lib/python2.7/site-packages/rflint/__init__.py", line 1, in <module>
390    from .rflint import RfLint, ERROR, WARNING
391  File "/home/travis/.local/lib/python2.7/site-packages/rflint/rflint.py", line 30, in <module>
392    from .parser import RobotFactory, SuiteFile, ResourceFile
393  File "/home/travis/.local/lib/python2.7/site-packages/rflint/parser/__init__.py", line 1, in <module>
394    from .parser import (SuiteFolder, ResourceFile, SuiteFile, RobotFactory, 
395  File "/home/travis/.local/lib/python2.7/site-packages/rflint/parser/parser.py", line 25, in <module>
396    from robot.utils import FileReader
397ImportError: cannot import name FileReader

See https://travis-ci.org/github/php-coder/mystamps/jobs/697009225

It happens because rflint 1.1 doesn't work with robotframework 3.1.2 that we pin (I should pin both). We can install older rflint or unpin robotframework.