Update twine from 1.14.0 to 2.0.0

Author: pyup-bot

dev-requirements.txt

@@ -23,7 +23,7 @@ PyYAML==5.1.2
 Sphinx==2.2.0
 sphinx-autodoc-typehints==1.8.0
 sphinxcontrib-spelling==4.3.0
-twine==1.14.0
+twine==2.0.0
 versioneer==0.18
 vulture==1.0
 VWS-Python-Mock==2018.12.1.0