Prevent JLine 2.12 bug from breaking bash prompt aver leaving Groovysh
workaround for https://github.com/jline/jline2/issues/163
is creating only one Terminal
Revert "revert jline dependency to 2.11 until fix is available for"

This also reverts commit c3b12c917ef22f27b2842b1f84dd9ecd84d62a09.
Merge pull request #510 from tkruse/jline212

GROOVY-6859, GROOVY-6998: Allow update to jline2.12