Update graphviz requirement from ==0.14.* to >=0.14,<0.17

[dependabot]

Updates the requirements on graphviz to permit the latest version.

Changelog

Sourced from graphviz's changelog.

Version 0.16

Add .unflatten() method to Graph, Digraph, and Source. Add standalone unflatten().

Make Source.__str__() return the .source instead of the repr() (like Graph and Digraph).

Render with dot -K<engine> ... instead of <engine> ... internally (work around upstream issue <https://gitlab.com/graphviz/graphviz/-/issues/1753>_).

Add documentation hint to archived upstream version for Windows.

Re-render most documentation graphs with Graphviz 2.44.1.

Version 0.15

Graph and Digraph instances created via the context-manager returned by subgraph() now (re)use directory, format, engine, and encoding from the parent instead of using defaults (behavioral change). Note that these attributes are only relevant when rendering the subgraph independently (i.e. as a stand-alone graph) from within the with-block, which was previously underdocumented (PR BMaxV). To reflect that the DOT language does not allow subgraph statements to specify strict (i.e. no way to override the setting of the containing graph), instances created via the context-manager are now strict=None instead of False (so they continue to render stand-alone as non-strict by default).

Drop Python 3.5 support and tag Python 3.9 support.

Add documentation link to new upstream installation procedure for Windows.

Version 0.14.2

Adapt graphviz.version() to support the Graphviz Release version entry format introduced with 2.44.2 (version() is needed to run the tests).

Version 0.14.1

Document the colon-separated node[:port[:compass]] format used for tail and head points in the edge()- and edges()-methods (PR Michał Góral).

... (truncated)

Commits

• 54b4eec release 0.16
• ebd2f99 duplicate notebook under old name to work around nbviewer cache invalidation
• d58fe75 reformat link
• 6c81671 document latest changes
• 384457a add hint for archived graphviz-2.38.msi to workaround known issues
• cf0146e re-render most graphs with latest Graphviz 2.44.1
• 422adc1 workaround Graphviz 2.44.1 missing engine commands except dot under Windows
• f97f2ab add chdir so the checked-out version is used
• bdab503 rename notebook.ipynb to graphviz-notebook.ipynb
• ab7e243 move default encoding definition to backend, re-order engine, format, encoding
• Additional commits viewable in compare view

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