Bump nltk from 3.3 to 3.4.5

[dependabot[bot]]

Bumps nltk from 3.3 to 3.4.5.

Changelog

Sourced from nltk's changelog.

Version 3.5 2020-04-13

• add support for Python 3.8
• 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 improvements in grammar.CFG, Vader, pl196x corpus reader, StringTokenizer
• change implementation = for FreqDist so they are partial orders
• make FreqDist iterable
• correctly handle Penn Treebank trees with a unlabeled branching top node.

Thanks to the following contributors to 3.5: Nicolas Darr, Gerhard Kremer, Liling Tan, Christopher Hench, Alexandre Dias, Hervé Nicol, Pierpaolo Pantone, Bonifacio de Oliveira, Maciej Gawinecki, BLKSerene, hoefling, alvations, pyfisch, srhrshr

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

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:
• 2554ff4 updates for 3.4.4
• fbda919 drop comment about implementation which is no longer accurate, and which did ...
• 8bcc98a Merge pull request #2319 from BLaZeKiLL/BLaZeKiLL-polt-bug-fix
• f6a4f38 Merge pull request #2291 from alvations/better-panlex
• 8c75c56 Merge pull request #2324 from minho42/Fix-typo
• Additional commits viewable in compare view

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[mikepapadim]

@dependabot rebase

[dependabot[bot]]

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