Update sympy to 1.6.2

[pyup-bot]

This PR updates sympy from 1.5.1 to 1.6.2.

Changelog

1.6.1

See https://github.com/sympy/sympy/wiki/release-notes-for-1.6.1 for the release notes.

<table> <tr> <th> Filename </th> <th> Description </th> <th> size </th> <th> sha256 </th> </tr> <tr> <td> <a href="https://github.com/sympy/sympy/releases/download/sympy-1.6.1/sympy-1.6.1.tar.gz"> <b> sympy-1.6.1.tar.gz </b> </a> </td> <td> The SymPy source installer. </td> <td> 6.0M </td> <td> 7386dba4f7e162e90766b5ea7cab5938c2fe3c620b310518c8ff504b283cb15b </td> </tr> <tr> <td> <a href="https://github.com/sympy/sympy/releases/download/sympy-1.6.1/sympy-1.6.1-py3-none-any.whl"> <b> sympy-1.6.1-py3-none-any.whl </b> </a> </td> <td> A wheel of the package. </td> <td> 5.5M </td> <td> 7f50d922bf055560429777447ac827620fd86d39d1de4ea057422e7552c65f3b </td> </tr> <tr> <td> <a href="https://github.com/sympy/sympy/releases/download/sympy-1.6.1/sympy-docs-html-1.6.1.zip"> <b> sympy-docs-html-1.6.1.zip </b> </a> </td> <td> Html documentation. This is the same as
the <a href="https://docs.sympy.org/latest/index.html">online documentation</a>. </td> <td> 11M </td> <td> d9672c1b15167671442927ad2a16f31b685b675b457f70cdadf0a543a737ba20 </td> </tr> <tr> <td> <a href="https://github.com/sympy/sympy/releases/download/sympy-1.6.1/sympy-docs-pdf-1.6.1.pdf"> <b> sympy-docs-pdf-1.6.1.pdf </b> </a> </td> <td> Pdf version of the <a href="https://docs.sympy.org/latest/index.html"> html documentation</a>. </td> <td> 8.5M </td> <td> 709d0d7a20e4db7f0d56f7a800093d0658e5864175f63c557fb5440aa81ea1a3 </td> </tr> </table>

**Note**: Do not download the **Source code (zip)** or the **Source code (tar.gz)**
files below.

1.6

See https://github.com/sympy/sympy/wiki/release-notes-for-1.6 for the release notes.

Links

• PyPI: https://pypi.org/project/sympy
• Changelog: https://pyup.io/changelogs/sympy/
• Homepage: https://sympy.org
• Docs: https://pythonhosted.org/sympy/

[pyup-bot]

Closing this in favor of #95