Add twine to development packages in Pipfile.

Author: rfoliva

Pipfile

@@ -17,6 +17,7 @@ pytest-rerunfailures = "*"
 tmuxp = {path = ".", editable = true}
 "e1839a8" = {path = ".", editable = true}
 "doc8" = "*"
+twine = "*"
 
 [packages]
 kaptan = "*"