Update .editorconfig to end files with newlines (#4533)

.editorconfig

@@ -4,7 +4,7 @@ root = true
 
 [*]
 end_of_line = lf
-insert_final_newline = false
+insert_final_newline = true
 charset = utf-8
 
 [*.go]
@@ -28,4 +28,4 @@ indent_style = tab
 
 [*.scss]
 indent_style = space
-indent_size = 4
+indent_size = 4