Fix compilation errors

Author: JD557

image/shared/src/main/scala/eu/joaocosta/minart/graphics/image/helpers/State.scala

@@ -9,7 +9,8 @@ sealed trait State[S, +E, +A] {
   def validate[EE >: E](test: A => Boolean, failure: A => EE): State[S, EE, A] =
     flatMap(x => if (test(x)) State.pure(x) else State.error(failure(x)))
   def collect[EE >: E, B](f: PartialFunction[A, B], failure: A => EE): State[S, EE, B] = {
-    val pf = f.andThen(State.pure[S, B]).orElse((x: A) => State.error[S, EE](failure(x)))
+    val pf =
+      f.andThen((x: B) => State.pure[S, B](x)).orElse[A, State[S, EE, B]]((x: A) => State.error[S, EE](failure(x)))
     flatMap(pf)
   }
   def modify(f: S => S): State[S, E, A] =

image/shared/src/main/scala/eu/joaocosta/minart/graphics/image/helpers/package.scala

@@ -60,7 +60,7 @@ package object helpers {
       State.modify(_.drop(n))
 
     val readByte: ParseState[String, Option[Int]] = State { bytes =>
-      val hd = bytes.nextOption
+      val hd = bytes.nextOption()
       bytes -> hd
     }
 
@@ -71,10 +71,10 @@ package object helpers {
 
     def readWhile(p: Int => Boolean): ParseState[Nothing, List[Int]] = State { bytes =>
       val buffer = List.newBuilder[Int]
-      var head   = bytes.nextOption
+      var head   = bytes.nextOption()
       while (head.exists(p)) {
         buffer += head.get
-        head = bytes.nextOption
+        head = bytes.nextOption()
       }
       (head.iterator ++ bytes) -> buffer.result()
     }