Bump transformers from 3.0.1 to 4.30.0

Bumps [transformers](https://github.com/huggingface/transformers) from 3.0.1 to 4.30.0.
- [Release notes](https://github.com/huggingface/transformers/releases)
- [Commits](huggingface/transformers@3.0.1...v4.30.0)

---
updated-dependencies:
- dependency-name: transformers
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -4,7 +4,7 @@ scipy==1.4.1
 scikit-learn==0.21.3
 torch==1.5.0
 tqdm==4.47.0
-transformers==3.0.1
+transformers==4.30.0
 tokenizers==0.8.0rc4
 tensorboardX==2.1
 cltk==0.1.121