Bump numpy from 1.15.0 to 1.22.0 (#52)

Bumps [numpy](https://github.com/numpy/numpy) from 1.15.0 to 1.22.0.
- [Release notes](https://github.com/numpy/numpy/releases)
- [Changelog](https://github.com/numpy/numpy/blob/main/doc/HOWTO_RELEASE.rst)
- [Commits](numpy/numpy@v1.15.0...v1.22.0)

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

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requirements.txt

@@ -2,7 +2,7 @@ setuptools==65.5.1
 matplotlib==2.2.2
 recommonmark==0.4.0
 gym==0.12.0
-numpy==1.15.0
+numpy==1.22.0
 oct2py==4.0.6
 pygame==1.9.4
 scipy==1.1.0