The class `org.cactoos.text.Replaced` uses `StringBuffer` instead of `StringBuilder` ([here](https://github.com/yegor256/cactoos/blob/3675019c59c64477e8b80a04a25f86d717d9ac4b/src/main/java/org/cactoos/text/Replaced.java#L88)). Let's change it because `StringBuilder` is more efficient.
The class
org.cactoos.text.ReplacedusesStringBufferinstead ofStringBuilder(here). Let's change it becauseStringBuilderis more efficient.