sanfilip windows curses fix (#380)

* use windows-curses on windows

* fix readme inaccuracy

* fix missing comma; add clean to Makefile

Author: sanfilip

Makefile

@@ -18,6 +18,9 @@ pip-install-dev: pip-update
 build:
 	python setup.py sdist bdist_wheel
 
+clean:
+	rm -rf build dist
+
 prepare-docs-source:
 	@sphinx-apidoc -f -o source gradient
 	@cp source/cli_docs/gradient.cli.rst source/gradient.cli.rst

Pipfile

@@ -26,6 +26,7 @@ sphinx = "*"
 recommonmark = "*"
 sphinx-click = "*"
 gql = {extras = ["requests"], version = "==3.0.0a6"}
+windows-curses = {version = ">=2.3.0", markers = "platform_system=='Windows'"}
 
 [dev-packages]
 twine = "*"