[elpa] externals/ggtags updated (17a121a -> 1c43705)

[Stefan Monnier]

monnier pushed a change to branch externals/ggtags.

      from  17a121a   Version 0.8.13
       new  a0809f5   Bump version and require Emacs >= 25
       new  c737181   Fix #158: ggtags-fontify-code improvement suggestion
       new  8840213   Correctly set `process-mark` in `ggtags-global-output`
       new  a2906b7   Allow `ggtags-global-output` to run the process 
synchronously
       new  c536ec5   Cache number of lines from previous output in 
`ggtags-global-output`
       new  6696764   Use `count-lines` instead of `line-number-at-pos`
       new  2f538aa   Add xref support
       new  4d90000   Fix #163: properly construct the --nearness arg to global
       new  1c43705   Update docs to use `universal-ctags` instead of 
`exuberant-ctags`


Summary of changes:
 README.rst |  19 +++--
 ggtags.el  | 241 ++++++++++++++++++++++++++++++++++++++-----------------------
 2 files changed, 162 insertions(+), 98 deletions(-)