Bump numpy from 1.15.4 to 1.22.0

Bumps [numpy](https://github.com/numpy/numpy) from 1.15.4 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@v1.15.4...v1.22.0)

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

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

Author: dependabot[bot]

requirements.txt

@@ -1,5 +1,5 @@
 matplotlib==3.0.2
-numpy==1.15.4
+numpy==1.22.0
 pandas==0.23.4
 plotly==3.9.0
 requests==2.21.0