0.6.0, travis tweaks

Don't bother building on JDK9, just 8 + 11 should cover it

.travis.yml

 language: java
 jdk:
   - oraclejdk8
-  - oraclejdk9
   - oraclejdk11
 before_install:
   - chmod +x gradlew

CHANGELOG

 vNEXT (in development)
 
+v0.6.0
+
  * Changed USER command to not send the server name, per modern standards
  * Added support for SASL authentication (with PLAIN mechanism)
  * Removed some unused test code

build.gradle.kts

 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
-version = "0.5.0"
+version = "0.6.0"
 group = "com.dmdirc.ktirc"
 
 plugins {

src/test/kotlin/com/dmdirc/ktirc/IrcClientTest.kt

 package com.dmdirc.ktirc
 
-import com.dmdirc.ktirc.events.*
+import com.dmdirc.ktirc.events.IrcEvent
+import com.dmdirc.ktirc.events.ServerConnected
+import com.dmdirc.ktirc.events.ServerConnecting
+import com.dmdirc.ktirc.events.ServerWelcome
 import com.dmdirc.ktirc.io.CaseMapping
 import com.dmdirc.ktirc.io.LineBufferedSocket
 import com.dmdirc.ktirc.model.*