Add missing newline

test/ostream-test.cc

@@ -275,4 +275,4 @@ std::ostream& operator<<(std::ostream& os,
 
 TEST(FormatterTest, FormatExplicitlyConvertibleToStringLikeIgnoreInserter) {
   EXPECT_EQ("foo", fmt::format("{}", explicitly_convertible_to_string_like()));
-}
+}