build(deps): bump objgraph from 3.4.1 to 3.5.0

[dependabot-preview]

Bumps objgraph from 3.4.1 to 3.5.0.

Changelog

Sourced from objgraph's changelog.

3.5.0 (2020-10-11)

• Do not require mock for the test suite on Python 3; use unittest.mock instead.
• 100% test coverage for each version of Python rather than combined, using coverage-python-version.
• Add the optional extra_node_attrs parameter to show_backrefs and show_backrefs
• Fix IPython/Jupyter inline graph support code that would kick in even if you explicitly passed a filename='foo.png' argument to show_refs/show_backrefs. See issue 47.
• Add support for Python 3.8.
• Drop support for Python 3.5.

Commits

• 427a01f Preparing release 3.5.0
• 085cce3 Cleaned up makefile, added 'make help', newer release.mk
• e33c849 Give the hacking docs a little refresh
• 5b41bb4 Drop support for Python 3.5
• 90be2be Make check-manifest happy
• 231405c Improve ipython/jupyter detection in PyCharm's pydev console
• a729c40 show_refs(filename='foo.png') should disable inline IPython graphs
• a0e609d Merge pull request #46 from pvalsecc/extra_node_attrs
• d13051e Fix the PR comments
• 6cfdc11 Add the extra_node_attrs parameter to show_refs
• Additional commits viewable in compare view

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