Bump numpy from 1.18.2 to 1.19.0 (#299)

Bumps [numpy](https://github.com/numpy/numpy) from 1.18.2 to 1.19.0.
- [Release notes](https://github.com/numpy/numpy/releases)
- [Changelog](https://github.com/numpy/numpy/blob/master/doc/HOWTO_RELEASE.rst.txt)
- [Commits](numpy/numpy@v1.18.2...v1.19.0)

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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

requirements.txt

@@ -5,5 +5,5 @@ Cython==0.29.16
 hypothesis==5.18.0
 pytest==5.4.3
 pytest-cov==2.10.0
-numpy==1.18.2
+numpy==1.19.0
 mypy-extensions==0.4.3