Add colorspacious as dev dependency

poetry.lock

@@ -109,6 +109,17 @@ category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
+[[package]]
+name = "colorspacious"
+version = "1.1.2"
+description = "A powerful, accurate, and easy-to-use Python library for doing colorspace conversions"
+category = "main"
+optional = false
+python-versions = "*"
+
+[package.dependencies]
+numpy = "*"
+
 [[package]]
 name = "coverage"
 version = "5.5"
@@ -609,7 +620,7 @@ testing = ["pytest (>=4.6)", "pytest-checkdocs (>=1.2.3)", "pytest-flake8", "pyt
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.6.2"
-content-hash = "bb03d24e8ec7fcbf38ca0726736a7cdcd3e3f38a2ad281f522e3aedce1540bfb"
+content-hash = "04a8ea0aadaea82e45408c37aa39aa70d802e8b497234f775159a9b8d8ac274f"
 
 [metadata.files]
 altgraph = [
@@ -653,6 +664,10 @@ colorama = [
     {file = "colorama-0.4.4-py2.py3-none-any.whl", hash = "sha256:9f47eda37229f68eee03b24b9748937c7dc3868f906e8ba69fbcbdd3bc5dc3e2"},
     {file = "colorama-0.4.4.tar.gz", hash = "sha256:5941b2b48a20143d2267e95b1c2a7603ce057ee39fd88e7329b0c292aa16869b"},
 ]
+colorspacious = [
+    {file = "colorspacious-1.1.2-py2.py3-none-any.whl", hash = "sha256:c78befa603cea5dccb332464e7dd29e96469eebf6cd5133029153d1e69e3fd6f"},
+    {file = "colorspacious-1.1.2.tar.gz", hash = "sha256:5e9072e8cdca889dac445c35c9362a22ccf758e97b00b79ff0d5a7ba3e11b618"},
+]
 coverage = [
     {file = "coverage-5.5-cp27-cp27m-macosx_10_9_x86_64.whl", hash = "sha256:b6d534e4b2ab35c9f93f46229363e17f63c53ad01330df9f2d6bd1187e5eaacf"},
     {file = "coverage-5.5-cp27-cp27m-manylinux1_i686.whl", hash = "sha256:b7895207b4c843c76a25ab8c1e866261bcfe27bfaa20c192de5190121770672b"},

pyproject.toml

@@ -30,6 +30,7 @@ attrs = "^21.2.0"
 PyQt5 = "^5.15.4"
 appdirs = "^1.4.4"
 atomicwrites = "^1.4.0"
+colorspacious = "^1.1.2"
 
 [tool.poetry.dev-dependencies]
 pytest = "^6.2.4"