add .news file to describe the fix

AdamGold · AdamGold · commit c3e3cfb0152b · 2019-01-17T14:10:41.000+02:00
diff --git a/news/2373.bugfix.rst b/news/2373.bugfix.rst
@@ -1 +1 @@
-Raise `PipenvUsageError` when [[source]] does not contain url field.
+Raise `PipenvUsageError` when [[source]] does not contain url field.

Original file line number	Diff line number	Diff line change
`@@ -1 +1 @@`
`1`		-Raise `PipenvUsageError` when [[source]] does not contain url field.
	`1`	+Raise `PipenvUsageError` when [[source]] does not contain url field.