Added Scala 2.10.7 as one of the cross build version, bumped up to use ScalaTest 3.1.0-SNAP8, and fixed problem encountered since SNAP8 is the release that does not contain testng integration code.

Author: cheeseng

build.sbt

@@ -2,7 +2,7 @@ name := "scalatestplus-testng"
 
 organization := "org.scalatestplus"
 
-version := "1.0.0-SNAP1"
+version := "1.0.0-SNAP2"
 
 homepage := Some(url("https://github.com/scalatest/scalatestplus-testng"))
 
@@ -23,10 +23,10 @@ developers := List(
   )
 )
 
-crossScalaVersions := List("2.11.12", "2.12.8", "2.13.0-M5")
+crossScalaVersions := List("2.10.7", "2.11.12", "2.12.8", "2.13.0-M5")
 
 libraryDependencies ++= Seq(
-  "org.scalatest" %% "scalatest" % "3.1.0-SNAP7",
+  "org.scalatest" %% "scalatest" % "3.1.0-SNAP8",
   "org.testng" % "testng" % "6.7", 
   "commons-io" % "commons-io" % "1.3.2" % "test"
 )

src/test/scala/org/scalatestplus/testng/example/ExampleTestNGSuite.scala

@@ -15,7 +15,7 @@
  */
 package org.scalatestplus.testng.example
 
-import org.scalatest.testng._
+import org.scalatestplus.testng._
 import org.testng.annotations.Test
 import org.testng.annotations.BeforeMethod
 import org.testng.annotations.BeforeClass

src/test/scala/org/scalatestplus/testng/example/ExampleTestNGWrapperSuite.scala

@@ -15,8 +15,7 @@
  */
 package org.scalatestplus.testng.example
 
-import org.scalatest.testng._
-import org.scalatest.testng.TestNGWrapperSuite
+import org.scalatestplus.testng.TestNGWrapperSuite
 
 class ExampleTestNGWrapperSuite extends TestNGWrapperSuite( 
     List("./src/test/scala/org/scalatestplus/testng/example/testngsuite.xml" )) {}