Bump pytest from 5.4.3 to 6.1.1 (#80)

Bumps [pytest](https://github.com/pytest-dev/pytest) from 5.4.3 to 6.1.1.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pytest/compare/5.4.3...6.1.1)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

requirements-dev.txt

@@ -20,12 +20,12 @@ docutils==0.16            # via readme-renderer
 filelock==3.0.12          # via tox, virtualenv
 flake8==3.8.3             # via -r requirements-dev.in
 idna==2.9                 # via requests
+iniconfig==1.0.1          # via pytest
 isort==4.3.21             # via pylint
 jeepney==0.4.3            # via keyring, secretstorage
 keyring==21.2.1           # via twine
 lazy-object-proxy==1.4.3  # via astroid
 mccabe==0.6.1             # via flake8, pylint
-more-itertools==8.4.0     # via pytest
 mypy-extensions==0.4.3    # via black, mypy
 mypy==0.790               # via -r requirements-dev.in
 packaging==20.4           # via bleach, pytest, tox
@@ -40,7 +40,7 @@ pyflakes==2.2.0           # via flake8
 pygments==2.6.1           # via readme-renderer
 pylint==2.6.0             # via -r requirements-dev.in
 pyparsing==2.4.7          # via packaging
-pytest==5.4.3             # via -r requirements-dev.in
+pytest==6.1.1             # via -r requirements-dev.in
 readme-renderer==26.0     # via twine
 regex==2020.6.8           # via black
 requests-toolbelt==0.9.1  # via twine
@@ -48,15 +48,14 @@ requests==2.24.0          # via requests-toolbelt, twine
 rfc3986==1.4.0            # via twine
 secretstorage==3.1.2      # via keyring
 six==1.15.0               # via astroid, bleach, cryptography, packaging, pip-tools, readme-renderer, tox, virtualenv
-toml==0.10.1              # via black, pylint, tox
+toml==0.10.1              # via black, pylint, pytest, tox
 tox==3.15.2               # via -r requirements-dev.in
-tqdm==4.50.1              # via -r requirements.txt, twine
+tqdm==4.50.2              # via -r requirements.txt, twine
 twine==3.2.0              # via -r requirements-dev.in
 typed-ast==1.4.1          # via black, mypy
 typing-extensions==3.7.4.2  # via black, mypy
 urllib3==1.25.9           # via requests
 virtualenv==20.0.24       # via tox
-wcwidth==0.2.4            # via pytest
 webencodings==0.5.1       # via bleach
 wrapt==1.12.1             # via astroid