Django update: smart_text() -> smart_str()

[jedie]

No description provided.

[codecov]

Codecov Report

Merging #37 (ef9fc7c) into master (c42a4d7) will increase coverage by 9.60%.
The diff coverage is 94.72%.

@@            Coverage Diff             @@
##           master      #37      +/-   ##
==========================================
+ Coverage   71.67%   81.27%   +9.60%     
==========================================
  Files         138      143       +5     
  Lines        7156     5849    -1307     
==========================================
- Hits         5129     4754     -375     
+ Misses       2027     1095     -932     

Impacted Files	Coverage Δ
django_tools/cache/smooth_cache_backends.py	44.44% <ø> (ø)
django_tools/filemanager/tests.py	31.25% <0.00%> (ø)
...ngo_tools/management/commands/nice_diffsettings.py	25.80% <0.00%> (ø)
django_tools/middlewares/QueryLogMiddleware.py	17.39% <0.00%> (ø)
django_tools/unittest_utils/unittest_base.py	80.67% <0.00%> (ø)
..._test_project/tests/test_ThreadLocal_middleware.py	100.00% <ø> (ø)
django_tools_test_project/tests/test_basics.py	100.00% <ø> (ø)
...ngo_tools_test_project/tests/test_database_info.py	100.00% <ø> (ø)
...jango_tools_test_project/tests/test_dom_asserts.py	100.00% <ø> (ø)
django_tools_test_project/tests/test_email.py	100.00% <ø> (ø)
... and 90 more

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