Update specs2-core, specs2-scalacheck to 4.8.1 (#40)

Update specs2-core, specs2-scalacheck to 4.8.1

Author: ChristopherDavenport

build.sbt

@@ -10,7 +10,7 @@ val catsEffectTestingV = "0.3.0"
 val log4catsV = "1.0.1"
 val logbackClassicV = "1.2.3"
 
-val specs2V = "4.8.0"
+val specs2V = "4.8.1"
 
 val kindProjectorV = "0.11.0"
 val betterMonadicForV = "0.3.1"