Remove pytest-clarity

It is missing a six dependency which causes the build to fail. I
could simply add six to the virtualenv but it feels dirty. I don't
actually *need* pytest-clarity for anything so I'll just remove it.

See: https://github.com/darrenburns/pytest-clarity/issues/14

poetry.lock

@@ -452,18 +452,6 @@ toml = "*"
 version = ">=0.12"
 python = "<3.8"
 
-[[package]]
-name = "pytest-clarity"
-version = "0.3.0a0"
-description = "A plugin providing an alternative, colourful diff output for failing assertions."
-category = "dev"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-
-[package.dependencies]
-pytest = ">=3.5.0"
-termcolor = "1.1.0"
-
 [[package]]
 name = "regex"
 version = "2020.11.13"
@@ -490,14 +478,6 @@ chardet = ">=3.0.2,<4"
 idna = ">=2.5,<3"
 urllib3 = ">=1.21.1,<1.27"
 
-[[package]]
-name = "termcolor"
-version = "1.1.0"
-description = "ANSII Color formatting for output in terminal."
-category = "dev"
-optional = false
-python-versions = "*"
-
 [[package]]
 name = "toml"
 version = "0.10.2"
@@ -575,7 +555,7 @@ testing = ["pytest (>=3.5,<3.7.3 || >3.7.3)", "pytest-checkdocs (>=1.2.3)", "pyt
 [metadata]
 lock-version = "1.0"
 python-versions = "^3.6"
-content-hash = "12341bae9a3c60ddc21a0334682520dd52ca54e35d88370cdfce81c10c125e7e"
+content-hash = "3cd45aacbfab0e85f74c7a010443432f4d6bf0f6cd3bbb84e11c8c7ea20a4613"
 
 [metadata.files]
 appdirs = [
@@ -775,9 +755,6 @@ pytest = [
     {file = "pytest-6.2.0-py3-none-any.whl", hash = "sha256:d69e1a80b34fe4d596c9142f35d9e523d98a2838976f1a68419a8f051b24cec6"},
     {file = "pytest-6.2.0.tar.gz", hash = "sha256:b12e09409c5bdedc28d308469e156127004a436b41e9b44f9bff6446cbab9152"},
 ]
-pytest-clarity = [
-    {file = "pytest-clarity-0.3.0a0.tar.gz", hash = "sha256:5cc99e3d9b7969dfe17e5f6072d45a917c59d363b679686d3c958a1ded2e4dcf"},
-]
 regex = [
     {file = "regex-2020.11.13-cp36-cp36m-macosx_10_9_x86_64.whl", hash = "sha256:8b882a78c320478b12ff024e81dc7d43c1462aa4a3341c754ee65d857a521f85"},
     {file = "regex-2020.11.13-cp36-cp36m-manylinux1_i686.whl", hash = "sha256:a63f1a07932c9686d2d416fb295ec2c01ab246e89b4d58e5fa468089cab44b70"},
@@ -825,9 +802,6 @@ requests = [
     {file = "requests-2.25.0-py2.py3-none-any.whl", hash = "sha256:e786fa28d8c9154e6a4de5d46a1d921b8749f8b74e28bde23768e5e16eece998"},
     {file = "requests-2.25.0.tar.gz", hash = "sha256:7f1a0b932f4a60a1a65caa4263921bb7d9ee911957e0ae4a23a6dd08185ad5f8"},
 ]
-termcolor = [
-    {file = "termcolor-1.1.0.tar.gz", hash = "sha256:1d6d69ce66211143803fbc56652b41d73b4a400a2891d7bf7a1cdf4c02de613b"},
-]
 toml = [
     {file = "toml-0.10.2-py2.py3-none-any.whl", hash = "sha256:806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b"},
     {file = "toml-0.10.2.tar.gz", hash = "sha256:b3bda1d108d5dd99f4a20d24d9c348e91c4db7ab1b749200bded2f839ccbe68f"},

pyproject.toml

@@ -18,7 +18,6 @@ flake8 = "^3.8.4"
 pytest = "^6.1.1"
 isort = "^5.5.4"
 black = "^20.8b1"
-pytest-clarity = "^0.3.0-alpha.0"
 
 [build-system]
 requires = ["poetry>=0.12"]