.editorconfig: end markdown files always with a newline

Author: siprbaum

.editorconfig

@@ -23,4 +23,10 @@ dotnet_separate_import_directive_groups = true
 
 [*.cake]
 indent_style = tab
-indent_size = 4
+indent_size = 4
+
+[*.md]
+# Ensure that the markdown files always end with a newline, which is e.g. especially
+# helpful for the docs/release/NEXT.md to ensure that adding a new entry/line
+# doesn't touch the previous one to reduce the diff & merge conflicts.
+insert_final_newline = true