Bump numpy from 1.20.1 to 1.20.2 (AtsushiSakai#493)

Bumps [numpy](https://github.com/numpy/numpy) from 1.20.1 to 1.20.2.
- [Release notes](https://github.com/numpy/numpy/releases)
- [Changelog](https://github.com/numpy/numpy/blob/main/doc/HOWTO_RELEASE.rst.txt)
- [Commits](numpy/numpy@v1.20.1...v1.20.2)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements.txt

@@ -1,4 +1,4 @@
-numpy == 1.20.1
+numpy == 1.20.2
 scipy == 1.6.2
 pandas == 1.2.2
 matplotlib == 3.4.0