replace unicode arrows

* ⇒, →, ←
* because we don't want to show them in documentation snippets and
  then it's complicated to avoid that when snippets are
  located in src/test/scala in individual modules
* dont replace object `→` in FSM.scala and PersistentFSM.scala

project/AutomaticModuleName.scala

@@ -19,6 +19,6 @@ object AutomaticModuleName  {
   private val AutomaticModuleName = "Automatic-Module-Name"
 
   def settings(name: String): Seq[Def.Setting[Task[Seq[PackageOption]]]] = Seq(
-    packageOptions in (Compile, packageBin) += Package.ManifestAttributes(AutomaticModuleName → name)
+    packageOptions in (Compile, packageBin) += Package.ManifestAttributes(AutomaticModuleName -> name)
   )
 }