Add options discussed in github-for-unity#248

Frozenfire92 · web-flow · commit 86c0b818add2 · 2018-04-14T15:25:44.000-03:00
diff --git a/.editorconfig b/.editorconfig
@@ -3,3 +3,5 @@ root = true
 [*.cs]
 indent_style = space
 indent_size = 4
+insert_final_newline = true
+trim_trailing_whitespace = true
