Up the version to 2.9 in dependency example
Up the version to 2.9 in dependency example

The readme was still showing the old 2.6 version in the dependency snippet.
This change just updates the version to 2.9.
renew-tgi/jline2,tkruse/jline2,fantasy86/jline2,scala/scala-jline,msaxena2/jline2,scala/scala-jline,kaulkie/jline2,ctubbsii/jline2,DALDEI/jline2