Add Scala 2.13.0-RC2 support

- upgrade Scala version from 2.13.0-RC1 to 2.13.0-RC2 in `build.sbt` and `.travis.yml`
- upgrade ScalaTest version from 3.0.8-RC2 to 3.1.0-SNAP11

Author: gslowikowski

.travis.yml

@@ -10,7 +10,7 @@ scala:
   - 2.10.7
   - 2.11.12
   - 2.12.8
-  - 2.13.0-RC1
+  - 2.13.0-RC2
 
 before_cache:
   - find "$HOME/.sbt/" -name '*.lock' -print0 | xargs -0 rm

build.sbt

@@ -6,12 +6,12 @@ import sbtcrossproject.CrossProject
 import sbtcrossproject.CrossType
 
 val Org = "org.scoverage"
-val ScalatestVersion = "3.0.8-RC2"
+val ScalatestVersion = "3.1.0-SNAP11"
 
 val appSettings = Seq(
     organization := Org,
     scalaVersion := "2.12.8",
-    crossScalaVersions := Seq("2.10.7", "2.11.12", "2.12.8", "2.13.0-RC1"),
+    crossScalaVersions := Seq("2.10.7", "2.11.12", "2.12.8", "2.13.0-RC2"),
     fork in Test := false,
     publishMavenStyle := true,
     publishArtifact in Test := false,