Bump nltk from 3.2 to 3.4.1

[dependabot-preview]

Bumps nltk from 3.2 to 3.4.1.

Changelog

Sourced from nltk's changelog.

Version 3.4.1 2019-04-17

• add chomsky_normal_form for CFGs
• add meteor score
• add minimum edit/Levenshtein distance based alignment function
• allow access to collocation list via text.collocation_list()
• support corenlp server options
• drop support for Python 3.4
• other minor fixes

Thanks to the following contributors to 3.4.1:
Adrian Ellis, Andrew Martin, Ayush Kaushal, BLKSerene, Bharat
Raghunathan, Franklin Chen, KMiNT21 Kevin Brown, Liling Tan,
Matan Rak, Nat Quayle Nelson, Osman Zubair, Purificant,
Uday Krishna, Viresh Gupta

Version 3.4 2018-11-17

• Support Python 3.7
• Language Modeling incl Kneser-Ney, Witten-Bell, Good-Turing
• Cistem Stemmer for German
• Support Russian National Corpus incl POS tag model
• Decouple sentiment and twitter packages
• Minor extensions for WordNet
• K-alpha
• Fix warning messages for corenlp
• Comprehensive code cleanups
• Many other minor fixes
• Switch continuous integration from Jenkins to Travis

Special thanks to Ilia Kurenkov (Language Model package), Liling Tan (Python 3.7, Travis-CI),
and purificant (code cleanups). Thanks also to: Afshin Sadeghi, Ales Tamchyna, Alok Debnath,
aquatiko, Coykto, Denis Kataev, dnc1994, Fabian Howard, Frankie Robertson, Iaroslav Tymchenko,
Jayakrishna Sahit, LBenzahia, Leonie Weißweiler, Linghao Zhang, Rohit Kumar, sahitpj,
Tim Gianitsos, vagrant, 53X

Version 3.3 2018-05-06

• Support Python 3.6
• New interface to CoreNLP
• Support synset retrieval by sense key
• Minor fixes to CoNLL Corpus Reader, AlignedSent
• Fixed minor inconsistencies in APIs and API documentation
• Better conformance to PEP8
• Drop moses.py (incompatible license)

Special thanks to Liling Tan for leading our transition to Python 3.6.
Thanks to other contributors listed here: https://github.com/nltk/nltk/blob/develop/AUTHORS.md

Version 3.2.5 2017-09-24

• Arabic stemmers (ARLSTem, Snowball)

... (truncated)

Commits

• 8db6a82 updates for 3.4.1
• 4115ed1 refactor text.collocations, resolves #2196 #2227
• ab3f193 Merge pull request #2260 from virresh/chomskycfg
• 5f6f2a4 Add unittests
• b4bd1fa Add chomsky_normal_form for CFGs
• f54c225 Merge pull request #2257 from okz12/develop
• 39af375 Corrected test case for new order of precedence in backtrace (skip before sub...
• 392095b Added operator import
• 0d332dd Added more test cases for metrics/edit_distance_align
• eee662b Changed backtrace to be more declarative
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #48.