Bump requests from 2.18.4 to 2.20.0 in /5_nlp_on_financial_statement

Bumps [requests](https://github.com/psf/requests) from 2.18.4 to 2.20.0.
- [Release notes](https://github.com/psf/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/master/HISTORY.md)
- [Commits](psf/requests@v2.18.4...v2.20.0)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

5_nlp_on_financial_statement/requirements.txt

@@ -2,7 +2,7 @@ alphalens==0.3.2
 nltk==3.3.0
 numpy==1.13.3
 ratelimit==2.2.0
-requests==2.18.4
+requests==2.20.0
 scikit-learn==0.19.1
 six==1.11.0
 tqdm==4.19.5