chore(deps): bump graphviz from 0.15 to 0.16 (#420)

Bumps [graphviz](https://github.com/xflr6/graphviz) from 0.15 to 0.16.
- [Release notes](https://github.com/xflr6/graphviz/releases)
- [Changelog](https://github.com/xflr6/graphviz/blob/master/CHANGES.txt)
- [Commits](https://github.com/xflr6/graphviz/compare/0.15...0.16)

Signed-off-by: dependabot[bot] <support@github.com>

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

poetry.lock

@@ -91,7 +91,7 @@ immutables = ">=0.9"
 
 [[package]]
 name = "graphviz"
-version = "0.15"
+version = "0.16"
 description = "Simple Python interface for Graphviz"
 category = "main"
 optional = false
@@ -333,7 +333,7 @@ testing = ["jaraco.itertools", "func-timeout"]
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.6"
-content-hash = "eaea28dae44851f383c06f8bd558a612247dac283eba0a4de6cdc55ff6b98677"
+content-hash = "6cb154d248e0d13adbb5229f52d1c1ab9ce2ea9cfe54091cf34cd97ccb822653"
 
 [metadata.files]
 appdirs = [
@@ -368,8 +368,8 @@ contextvars = [
     {file = "contextvars-2.4.tar.gz", hash = "sha256:f38c908aaa59c14335eeea12abea5f443646216c4e29380d7bf34d2018e2c39e"},
 ]
 graphviz = [
-    {file = "graphviz-0.15-py2.py3-none-any.whl", hash = "sha256:403b55553b235875fa521023a06d9c29b46f3a956f960d4e0a5b956bca9eb9ce"},
-    {file = "graphviz-0.15.zip", hash = "sha256:2b85f105024e229ec330fe5067abbe9aa0d7708921a585ecc2bf56000bf5e027"},
+    {file = "graphviz-0.16-py2.py3-none-any.whl", hash = "sha256:3cad5517c961090dfc679df6402a57de62d97703e2880a1a46147bb0dc1639eb"},
+    {file = "graphviz-0.16.zip", hash = "sha256:d2d25af1c199cad567ce4806f0449cb74eb30cf451fd7597251e1da099ac6e57"},
 ]
 immutables = [
     {file = "immutables-0.11-cp35-cp35m-macosx_10_13_x86_64.whl", hash = "sha256:bce27277a2fe91509cca69181971ab509c2ee862e8b37b09f26b64f90e8fe8fb"},

pyproject.toml

@@ -11,7 +11,7 @@ include = ["resources/**/*"]
 
 [tool.poetry.dependencies]
 python = "^3.6"
-graphviz = ">=0.13.2,<0.16.0"
+graphviz = ">=0.13.2,<0.17.0"
 jinja2 = "^2.10"
 contextvars = { version = "^2.4", python = "~3.6" }