Update tqdm to 4.48.0

[pyup-bot]

This PR updates tqdm from 4.43.0 to 4.48.0.

Changelog

4.47.0

- add `contrib.discord` (similar to `contrib.telegram`) (976)
- add `contrib.bells` to auto-enable all extras
- add `contrib.utils_worker` for common slow tasks (e.g. web I/O)
+ fix lazy large memory usage & discard unsent messages (unprocessed tasks)
- fix slow notebook imports (955 <- 709)
- fix `gui` `TypeError` on unknown `len()` (971)
- misc documentation/error message updates
+ more succinct ImportError on missing `ipywidgets` (872)
+ fix broken/deprecated link (981)
+ add inline usage for `contrib.discord` and `contrib.telegram`
- misc framework updates
+ add official `py3.8` support (986)
+ fix `snap` builds

![contrib.discord](https://user-images.githubusercontent.com/10780059/82755091-62374c80-9dc9-11ea-88bb-fd8cafe854ff.png)

![contrib.telegram](https://github.com/ermakovpetr/tg_tqdm/blob/master/tg_tqdm_how_it_work.gif?raw=true)

4.46.1

- fix missing `sys.setcheckinterval` in py3.9 (978)
- fix `keras.TqdmCallback` compatibility with `tensorflow==2.2.0` (979)
- update documentation
+ correct `contrib.concurrent` correct `max_workers` (977)
+ drop prominent mention of `xrange` (965)
- minor linting

4.46.0

- add `contrib.telegram` 949 <- 948
- add `bash` tab completion and `--comppath` 946, 947 <- 858
- fix exception safety in `external_write_mode` 940
- add `requests` examples (242)
- update documentation

4.45.0

- propagate and `close()` on exceptions (926 <- 548)
- fix nested `clear()`
- rework nested `close()` (930 <- 924 <- 918, 677)
+ reduces screen flicker/blank space at the cost of ordering
- update all documentation & demos
- add and update tests
- dev framework: add pre-commit helper

4.44.1

- fix `_utils` `ImportError` => `DeprecationWarning` (928 <- 927)

4.44.0

- add automatic `nrows` and expose for manual override (918 -> 924)
- expose and warn about small `chunksize` in `tqdm.contrib.concurrent.process_map` (912)
- fix py2 file stream comparison (727 -> 730)
- deprecate `utils._environ_cols_wrapper`
- add and update tests
- add documentation

Links

• PyPI: https://pypi.org/project/tqdm
• Changelog: https://pyup.io/changelogs/tqdm/
• Repo: https://github.com/tqdm/tqdm

[pyup-bot]

Closing this in favor of #145