Update numpydoc requirement from ~=1.0.0 to ~=1.1.0 (#618)

Updates the requirements on [numpydoc](https://github.com/numpy/numpydoc) to permit the latest version.
- [Release notes](https://github.com/numpy/numpydoc/releases)
- [Changelog](https://github.com/numpy/numpydoc/blob/master/doc/release_notes.rst)
- [Commits](numpy/numpydoc@v1.0.0...v1.1.0)

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

Author: dependabot-preview[bot]

requirements-dev.txt

@@ -6,7 +6,7 @@ vcrpy ~=4.1.0
 doctr ~=1.8.0
 ipython ~=7.16.1
 matplotlib ~=3.3.0
-numpydoc ~=1.0.0
+numpydoc ~=1.1.0
 requests-mock ~=1.8.0
 sphinx ~=3.1.2
 sphinx_rtd_theme ~=0.5.0