feat: add support for Scala 2.13.8 (#440)

Addresses #430

Author: ckipp01

.github/workflows/ci.yml

@@ -28,14 +28,10 @@ jobs:
             { version: '2.12.10' },
             { version: '2.12.9' },
             { version: '2.12.8' },
+            { version: '2.13.8' },
             { version: '2.13.7' },
             { version: '2.13.6' },
             { version: '2.13.5' },
-            { version: '2.13.4' },
-            { version: '2.13.3' },
-            { version: '2.13.2' },
-            { version: '2.13.1' },
-            { version: '2.13.0' }
           ]
     steps:
       - name: checkout the repo

build.sbt

@@ -2,8 +2,8 @@ import sbtcrossproject.CrossProject
 import sbtcrossproject.CrossType
 
 val scalatestVersion = "3.2.10"
-val scalametaVersion = "4.4.30"
-val defaultScala213 = "2.13.7"
+val scalametaVersion = "4.4.32"
+val defaultScala213 = "2.13.8"
 val bin211 = Seq("2.11.12")
 val bin212 =
   Seq(
@@ -19,6 +19,7 @@ val bin212 =
 val bin213 =
   Seq(
     defaultScala213,
+    "2.13.7",
     "2.13.6",
     "2.13.5",
     "2.13.4",