Uri.Path.Segment.equals throws a MatchError when passed a parameter of another type

[mattyjbrown]

import org.http4s.Uri
Uri.Path.Segment.apply("123") == 123

result:

scala.MatchError: 123 (of class java.lang.Integer)
  at org.http4s.Uri$Path$Segment.equals(Uri.scala:468)

Missing a case _ => false:

  override def equals(obj: Any): Boolean =
    obj match {
      case s: Segment => s.encoded == encoded
    }

Other classes in Uri.scala have it, example:

  final class Scheme private[http4s] (val value: String) extends Ordered[Scheme] {
    override def equals(o: Any): Boolean =
      o match {
        case that: Scheme => this.value.equalsIgnoreCase(that.value)
        case _ => false
      }

[mattyjbrown]

Proposed fix at #6853