Install black as dev-dependency, run black --check in CI (#305)

This will result in 2 copies of black, 1 in pre-commit and 1 in dev.
I think that's acceptable though, as I install black locally anyway.

appveyor.yml

@@ -43,6 +43,7 @@ build_script:
   - exit
 
 test_script:
+  - 'poetry run black --check .'
   - 'poetry run pytest --tb=short --cov=corrscope'
   - 'poetry run codecov'
 

poetry.lock

@@ -30,6 +30,20 @@ optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 version = "19.1.0"
 
+[[package]]
+category = "dev"
+description = "The uncompromising code formatter."
+name = "black"
+optional = false
+python-versions = ">=3.6"
+version = "18.9b0"
+
+[package.dependencies]
+appdirs = "*"
+attrs = ">=17.4.0"
+click = ">=6.5"
+toml = ">=0.9.4"
+
 [[package]]
 category = "dev"
 description = "Python package for providing Mozilla's CA Bundle."
@@ -387,6 +401,14 @@ optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*"
 version = "1.12.0"
 
+[[package]]
+category = "dev"
+description = "Python Library for Tom's Obvious, Minimal Language"
+name = "toml"
+optional = false
+python-versions = "*"
+version = "0.10.0"
+
 [[package]]
 category = "dev"
 description = "HTTP library with thread-safe connection pooling, file post, and more."
@@ -420,7 +442,7 @@ python-versions = ">=2.7"
 version = "0.5.2"
 
 [metadata]
-content-hash = "e10527789e21f31387445f9398e8cc0d5393df88d2dcac657dde50371f436ce7"
+content-hash = "42677c2074f91dfd94d840d24989a45ac5f6e443e64a8db9d06b5fa32cb69735"
 python-versions = "^3.6"
 
 [metadata.hashes]
@@ -428,6 +450,7 @@ altgraph = ["d6814989f242b2b43025cba7161fc1b8fb487a62cd49c49245d6fd01c18ac997",
 appdirs = ["9e5896d1372858f8dd3344faf4e5014d21849c756c8d5701f78f8a103b372d92", "d8b24664561d0d34ddfaec54636d502d7cea6e29c3eaf68f3df6180863e2166e"]
 atomicwrites = ["03472c30eb2c5d1ba9227e4c2ca66ab8287fbfbbda3888aa93dc2e28fc6811b4", "75a9445bac02d8d058d5e1fe689654ba5a6556a1dfd8ce6ec55a0ed79866cfa6"]
 attrs = ["69c0dbf2ed392de1cb5ec704444b08a5ef81680a61cb899dc08127123af36a79", "f0b870f674851ecbfbbbd364d6b5cbdff9dcedbc7f3f5e18a6891057f21fe399"]
+black = ["817243426042db1d36617910df579a54f1afd659adb96fc5032fcf4b36209739", "e030a9a28f542debc08acceb273f228ac422798e5215ba2a791a6ddeaaca22a5"]
 certifi = ["046832c04d4e752f37383b628bc601a7ea7211496b4638f6514d0e5b9acc4939", "945e3ba63a0b9f577b1395204e13c3a231f9bc0223888be653286534e5873695"]
 chardet = ["84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae", "fc323ffcaeaed0e0a02bf4d117757b98aed530d9ed4531e3e15460124c106691"]
 click = ["2335065e6395b9e67ca716de5f7526736bfa6ceead690adf616d925bdc622b13", "5b94b49521f6456670fdb30cd82a4eca9412788a93fa6dd6df72c94d5a8ff2d7"]
@@ -462,6 +485,7 @@ requests = ["11e007a8a2aa0323f5a921e9e6a2d7e4e67d9877e85773fba9ba6419025cbeb4",
 "ruamel.yaml" = ["547aeab5c51c93bc750ed2a320c1559b605bde3aa569216aa75fd91d8a1c4623", "c5e239b6a4f26baabb2e22b145582a7d99ae9d4ebb8902291365a61ed38faa7f"]
 "ruamel.yaml.clib" = ["0bbe19d3e099f8ba384e1846e6b54f245f58aeec8700edbbf9abb87afa54fd82", "2f38024592613f3a8772bbc2904be027d9abf463518ba145f2d0c8e6da27009f", "44449b3764a3f75815eea8ae5930b98e8326be64a90b0f782747318f861abfe0", "5710be9a357801c31c1eaa37b9bc92d38176d785af5b2f0c9751385c5dc9659a", "5a089acb6833ed5f412e24cbe3e665683064c1429824d2819137b5ade54435c3", "6143386ddd61599ea081c012a69a16e5bdd7b3c6c231bd039534365a48940f30", "6726aaf851f5f9e4cbdd3e1e414bc700bdd39220e8bc386415fd41c87b1b53c2", "68fbc3b5d94d145a391452f886ae5fca240cb7e3ab6bd66e1a721507cdaac28a", "75ebddf99ba9e0b48f32b5bdcf9e5a2b84c017da9e0db7bf11995fa414aa09cd", "79948a6712baa686773a43906728e20932c923f7b2a91be7347993be2d745e55", "8a2dd8e8b08d369558cade05731172c4b5e2f4c5097762c6b352bd28fd9f9dc4", "c747acdb5e8c242ab2280df6f0c239e62838af4bee647031d96b3db2f9cefc04", "cadc8eecd27414dca30366b2535cb5e3f3b47b4e2d6be7a0b13e4e52e459ff9f", "cee86ecc893a6a8ecaa7c6a9c2d06f75f614176210d78a5f155f8e78d6989509", "e59af39e895aff28ee5f55515983cab3466d1a029c91c04db29da1c0f09cf333", "eee7ecd2eee648884fae6c51ae50c814acdcc5d6340dc96c970158aebcd25ac6", "ef8d4522d231cb9b29f6cdd0edc8faac9d9715c60dc7becbd6eb82c915a98e5b", "f504d45230cc9abf2810623b924ae048b224a90adb01f97db4e766cfdda8e6eb"]
 six = ["3350809f0555b11f552448330d0b52d5f24c91a322ea4a15ef22629740f3761c", "d16a0141ec1a18405cd4ce8b4613101da75da0e9a7aec5bdd4fa804d0e0eba73"]
+toml = ["229f81c57791a41d65e399fc06bf0848bab550a9dfd5ed66df18ce5f05e73d5c", "235682dd292d5899d361a811df37e04a8828a5b1da3115886b73cf81ebc9100e", "f1db651f9657708513243e61e6cc67d101a39bad662eaa9b5546f789338e07a3"]
 urllib3 = ["b246607a25ac80bedac05c6f282e3cdaf3afb65420fd024ac94435cabe6e18d1", "dbe59173209418ae49d485b87d1681aefa36252ee85884c31346debd19463232"]
 wcwidth = ["3df37372226d6e63e1b1e1eda15c594bca98a22d33a23832a90998faa96bc65e", "f4ebe71925af7b40a864553f761ed559b43544f8f71746c2d756c7fe788ade7c"]
 wrapt = ["565a021fd19419476b9362b05eeaa094178de64f8361e44468f9e9d7843901e1"]

pyproject.toml

@@ -33,6 +33,7 @@ pytest-cov = "^2.6"
 codecov = "^2.0"
 pytest_cases = "^1.2"
 pyinstaller = "^3.5"
+black = {version = "^18.3-alpha.0", allows-prereleases = true}
 [tool.poetry.scripts]
 corr = 'corrscope.cli:main'