Drop unused dependencies (#190)

* drop getch

* drop colorama

* drop flake8

Author: braingram

pyproject.toml

@@ -49,13 +49,10 @@ docs = [
 ]
 test = [
     "ci-watson >=0.3.0",
-    "colorama >=0.4.1",
-    "getch >=1.0.0",
     "pytest >=4.6.0, <=8.0",
     "pytest-openfiles >=0.5.0",
     "pytest-doctestplus >=0.10.0",
     "pytest-cov >=2.9.0",
-    "flake8 >=3.6.0",
 ]
 
 [project.urls]