changelog.md: Fix dead link to the spec
changelog.md: Fix dead link to the spec
jeantil/scala-lang,vl4ds/scala-lang,jeantil/scala-lang,vl4ds/scala-lang,boldradius/scala-lang,boldradius/scala-lang,andy1138/scala-lang,boldradius/scala-lang,vl4ds/scala-lang,andy1138/scala-lang,jeantil/scala-lang,boldradius/scala-lang,andy1138/scala-lang,jeantil/scala-lang,andy1138/scala-lang,vl4ds/scala-lang