Changed to 'internal' the scope of error messages factories

Author: rcardin

src/main/kotlin/in/rcard/assertj/arrowcore/errors/EitherShouldBeLeft.kt

@@ -8,9 +8,9 @@ import org.assertj.core.error.BasicErrorMessageFactory
  *
  * @author Riccardo Cardin
  */
-class EitherShouldBeLeft(actual: Either<*, *>) :
+internal class EitherShouldBeLeft(actual: Either<*, *>) :
     BasicErrorMessageFactory("%nExpecting an Either to be left but was <$actual>.") {
     companion object {
-        fun shouldBeLeft(actual: Either<*, *>): EitherShouldBeLeft = EitherShouldBeLeft(actual)
+        internal fun shouldBeLeft(actual: Either<*, *>): EitherShouldBeLeft = EitherShouldBeLeft(actual)
     }
 }

src/main/kotlin/in/rcard/assertj/arrowcore/errors/EitherShouldBeRight.kt

@@ -8,9 +8,9 @@ import org.assertj.core.error.BasicErrorMessageFactory
  *
  * @author Riccardo Cardin
  */
-class EitherShouldBeRight(actual: Either<*, *>) :
+internal class EitherShouldBeRight(actual: Either<*, *>) :
     BasicErrorMessageFactory("%nExpecting an Either to be right but was <$actual>.") {
     companion object {
-        fun shouldBeRight(actual: Either<*, *>): EitherShouldBeRight = EitherShouldBeRight(actual)
+        internal fun shouldBeRight(actual: Either<*, *>): EitherShouldBeRight = EitherShouldBeRight(actual)
     }
 }

src/main/kotlin/in/rcard/assertj/arrowcore/errors/EitherShouldContain.kt

@@ -8,7 +8,7 @@ import org.assertj.core.error.BasicErrorMessageFactory
  *
  * @author Riccardo Cardin
  */
-class EitherShouldContain(message: String, actual: Either<Any, Any>, expected: Any) :
+internal class EitherShouldContain(message: String, actual: Either<Any, Any>, expected: Any) :
     BasicErrorMessageFactory(message, actual, expected) {
 
     companion object {
@@ -27,7 +27,7 @@ class EitherShouldContain(message: String, actual: Either<Any, Any>, expected: A
          * @param RIGHT         the type of the value contained in the [Either] on the right side.
          * @return an error message factory
          */
-        fun <LEFT : Any, RIGHT : Any> shouldContainOnRight(
+        internal fun <LEFT : Any, RIGHT : Any> shouldContainOnRight(
             actual: Either<LEFT, RIGHT>,
             expectedValue: RIGHT
         ): EitherShouldContain = EitherShouldContain(
@@ -45,7 +45,7 @@ class EitherShouldContain(message: String, actual: Either<Any, Any>, expected: A
          * @param RIGHT       the type of the value contained in the [Either] on the right side.
          * @return an error message factory
          */
-        fun <LEFT : Any, RIGHT : Any> shouldContainOnLeft(
+        internal fun <LEFT : Any, RIGHT : Any> shouldContainOnLeft(
             actual: Either<LEFT, RIGHT>,
             expectedValue: RIGHT
         ): EitherShouldContain = EitherShouldContain(

src/main/kotlin/in/rcard/assertj/arrowcore/errors/EitherShouldContainInstanceOf.kt

@@ -9,7 +9,7 @@ import org.assertj.core.error.BasicErrorMessageFactory
  *
  * @author Riccardo Cardin
  */
-class EitherShouldContainInstanceOf(message: String) : BasicErrorMessageFactory(message) {
+internal class EitherShouldContainInstanceOf(message: String) : BasicErrorMessageFactory(message) {
   companion object {
     private const val EXPECTING_TO_CONTAIN_DIFFERENT_INSTANCE =
         "%nExpecting:%n <%s>%nto contain a value that is an instance of:%n <%s>%nbut did contain an instance of:%n <%s>"
@@ -24,7 +24,7 @@ class EitherShouldContainInstanceOf(message: String) : BasicErrorMessageFactory(
      * @return an error message factory.
      * @throws java.lang.NullPointerException if either is null.
      */
-    fun shouldContainOnRightInstanceOf(
+    internal fun shouldContainOnRightInstanceOf(
         actual: Either<Any, Any>,
         expectedClass: Class<*>
     ): EitherShouldContainInstanceOf =