[elpa] externals/xr updated (7842512 -> 434b300)

[Mattias Engdeg�rd]

mattiase pushed a change to branch externals/xr.

      from  7842512   Increment version to 1.17
       new  5394d8c   Simplify condition
       new  15b867d   Fix test in Emacs 26 (bug #3)
       new  434b300   Increment version to 1.18


Summary of changes:
 xr-test.el | 2 +-
 xr.el      | 7 ++++---
 2 files changed, 5 insertions(+), 4 deletions(-)