Bump numpy from 1.19.5 to 1.20.3 (#342)

Bumps [numpy](https://github.com/numpy/numpy) from 1.19.5 to 1.20.3.
- [Release notes](https://github.com/numpy/numpy/releases)
- [Changelog](https://github.com/numpy/numpy/blob/main/doc/HOWTO_RELEASE.rst.txt)
- [Commits](https://github.com/numpy/numpy/compare/v1.19.5...v1.20.3

)

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requirements.txt

@@ -6,7 +6,7 @@ futures
 fuzzywuzzy==0.18.0
 lxml==4.6.3
 matplotlib==2.2.5
-numpy==1.19.5
+numpy==1.20.3
 nltk==3.6.2
 Pillow>=3.4.1
 python-crfsuite==0.9.7