Bump numpy from 1.16.5 to 1.18.1 (#188)

Bumps [numpy](https://github.com/numpy/numpy) from 1.16.5 to 1.18.1.
- [Release notes](https://github.com/numpy/numpy/releases)
- [Changelog](https://github.com/numpy/numpy/blob/master/doc/HOWTO_RELEASE.rst.txt)
- [Commits](https://github.com/numpy/numpy/compare/v1.16.5...v1.18.1

)

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

requirements.txt

@@ -6,7 +6,7 @@ futures
 fuzzywuzzy==0.17.0
 lxml==4.4.2
 matplotlib==2.2.4
-numpy==1.16.5
+numpy==1.18.1
 nltk==3.4.5
 Pillow>=3.4.1
 python-crfsuite==0.9.6