Support openjdk 10

[aleixq]

Thank's for this tool! Compiling or running it in arch with this openjdk jre:

$ java --version
openjdk 10.0.2 2018-07-17
OpenJDK Runtime Environment (build 10.0.2+13)
OpenJDK 64-Bit Server VM (build 10.0.2+13, mixed mode)

gives:

target/universal/stage/bin/quick-plan  

The java installation you have is not up to date
requires at least version 1.6+, you have
version 10.0.2

Please go to http://www.java.com/getjava/ and download
a valid Java Runtime and install before running .

I have no idea about scala, but the solution I found is increasing the sbt native packager version as it's now solved ( sbt/sbt-native-packager#1145 ).
changing this line:

quick-plan/project/plugins.sbt

Line 2 in 7ba9176

addSbtPlugin("com.typesafe.sbt" % "sbt-native-packager" % "1.3.3")

solves it .

[mgifos]

Thanks for noticing and pointing out where the problem was. It's fixed in sbt-native-packager:1.3.6, so I used this dependency version to fix the bug.