Bump the version to 0.12, stop release cross building for prior to 1.6 (still in the build file), add 2.4.2/2.43, mention kafka support only built for 2.11

Author: holdenk

README.md

@@ -12,10 +12,10 @@ This is not my beautiful code.
 
 ## How?
 
-So you include com.holdenkarau.spark-testing-base [spark_version]_0.10.0 and extend one of the classes and write some simple tests instead.  For example to include this in a project using Spark 2.3.1:
+So you include com.holdenkarau.spark-testing-base [spark_version]_0.12.0 and extend one of the classes and write some simple tests instead.  For example to include this in a project using Spark 2.3.1:
 
 ```scala
-"com.holdenkarau" %% "spark-testing-base" % "2.3.1_0.11.0" % "test"
+"com.holdenkarau" %% "spark-testing-base" % "2.3.1_0.12.0" % "test"
 ```
 
 or
@@ -32,7 +32,7 @@ or
 If you'd like to use Kafka related features you need to include this artefact to your dependencies as well:
 
 ```scala
-"com.holdenkarau" %% "spark-testing-kafka-0_8" % "2.3.1_0.11.0" % "test"
+"com.holdenkarau" %% "spark-testing-kafka-0_8" % "2.3.1_0.12.0" % "test"
 ```
 
 or
@@ -41,11 +41,13 @@ or
 <dependency>
     <groupId>com.holdenkarau</groupId>
     <artifactId>spark-testing-kafka-0_8_2.11</artifactId>
-    <version>${spark.version}_0.11.0</version>
+    <version>${spark.version}_0.12.0</version>
     <scope>test</scope>
 </dependency>
 ```
 
+Currently the Kafka dependency is *only* built for Scala 2.11.
+
 How to use it inside your code? have a look at the [wiki](https://github.com/holdenk/spark-testing-base/wiki) page.
 
 The [Maven repositories page for spark-testing-base](https://mvnrepository.com/artifact/com.holdenkarau) lists the releases available.

build.sbt

@@ -68,7 +68,7 @@ val commonSettings = Seq(
   organization := "com.holdenkarau",
   publishMavenStyle := true,
   sparkVersion := "2.4.0",
-  sparkTestingVersion := "0.11.0",
+  sparkTestingVersion := "0.12.0",
   version := sparkVersion.value + "_" + sparkTestingVersion.value,
   scalaVersion := {
     if (sparkVersion.value >= "2.0.0") {

mini-cross-build.pl

@@ -2,7 +2,13 @@
 use File::Slurp;
 use strict;
 use warnings;
-my @spark_versions = ("1.4.0", "1.4.1", "1.5.0", "1.5.1", "1.5.2", "1.6.0", "1.6.1", "1.6.2", "1.6.3", "2.0.0", "2.0.1", "2.0.2", "2.1.0", "2.1.1", "2.1.2", "2.1.3", "2.2.0", "2.2.1", "2.2.2", "2.2.3", "2.3.0", "2.3.1", "2.3.2", "2.3.3", "2.4.0", "2.4.1");
+my @spark_versions = (
+    "1.6.0", "1.6.1", "1.6.2", "1.6.3",
+    "2.0.0", "2.0.1", "2.0.2", "2.1.0",
+    "2.1.1", "2.1.2", "2.1.3",
+    "2.2.0", "2.2.1", "2.2.2", "2.2.3",
+    "2.3.0", "2.3.1", "2.3.2", "2.3.3",
+    "2.4.0", "2.4.1", "2.4.2", "2.4.3");
 # Backup the build file
 `cp build.sbt build.sbt_back`;
 # Get the original version