Update nltk to 3.2.5

[pyup-bot]

There's a new version of nltk available.
You are currently using 3.2.2. I have updated it to 3.2.5

These links might come in handy: PyPI | Changelog | Homepage

Changelog

3.2.5

Ali Abdullah, Lakhdar Benzahia, Henry Elder, Campion Fellin,
Tsolak Ghukasyan, Thanh Ha, Jean Helie, Nelson Liu,
Nathan Schneider, Chintan Shah, Fábio Silva, Liling Tan,
Ziyao Wei, Zicheng Xu, Albert Au Yeung, AbdealiJK,
porqupine, sbagan, xprogramer

3.2.4

Alex Constantin, Hatem Nassrat, Liling Tan

3.2.3

Mark Amery, Carl Bolz, Abdelhak Bougouffa, Matt Chaput, Michael Goodman,
Jaehoon Hwang, Naoya Kanai, Jackson Lee, Christian Meyer, Dmitrijs Milajevs,
Adam Nelson, Pierpaolo Pantone, Liling Tan, Vilhjalmur Thorsteinsson,
Arthur Tilley, jmhutch, Yorwba, eromoe and others

Got merge conflicts? Close this PR and delete the branch. I'll create a new PR for you.

Happy merging! 🤖