Bump nltk from 3.4.4 to 3.4.5 in /dash-django-example

[dependabot]

Bumps nltk from 3.4.4 to 3.4.5.

Changelog

Sourced from nltk's changelog.

Version 3.5 2019-10-16

• drop support for Python 2
• create NLTK's own Tokenizer class distinct from the Treebank reference tokeniser
• update Vader sentiment analyser
• fix JSON serialization of some PoS taggers
• minor bug fixes and clean ups

Thanks to the following contributors to 3.5:
Nicolas Darr, Gerhard Kremer, Liling Tan, Christopher Hench, Alexandre Dias,
Hervé Nicol, BLKSerene, hoefling

Version 3.4.5 2019-08-20

• Fixed security bug in downloader: Zip slip vulnerability - for the unlikely
  situation where a user configures their downloader to use a compromised server
  https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-14751)

Thanks to the following contributors to 3.4.5:
Mike Salvatore

Version 3.4.4 2019-07-04

• fix bug in plot function (probability.py)
• add improved PanLex Swadesh corpus reader

Thanks to the following contributors to 3.4.4:
Devashish Lal, Liling Tan

Version 3.4.3 2019-06-07

• add Text.generate()
• add QuadgramAssocMeasures
• add SSP to tokenizers
• return confidence of best tag from AveragedPerceptron
• make plot methods return Axes objects
• don't require list arguments to PositiveNaiveBayesClassifier.train
• fix Tree classes to work with native Python copy library
• fix inconsistency for NomBank
• fix random seeding in LanguageModel.generate
• fix ConditionalFreqDist mutation on tabulate/plot call
• fix broken links in documentation
• fix misc Wordnet issues
• update installation instructions

Thanks to the following contributors to 3.4.3:
alvations, Bharat123rox, cifkao, drewmiller, free-variation, henchc
irisxzhou, nick-ulle, ppartarr, simonepri, yigitsever, zhaoyanpeng

Version 3.4.1 2019-04-17

• add chomsky_normal_form for CFGs
• add meteor score

... (truncated)

Commits

• 6b0312a Merge pull request #2446 from sildar/3.4.5
• 3d5e597 Fix devnull error on python2.7
• acca8d5 updates for 3.4.5
• 083bbf0 updates for 3.4.5
• f59d7ed CVE-2019-14751:
• See full diff in compare view

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