Log Message:
tig: update to 2.5.6.

tig-2.5.6
---------

Bug fixes:

 - Fix `:goto <tag>`. (#1178)
 - Fix typo in ui.c.
 - Revert terminal hacks and workarounds. (#748, #943, #1180, #1182)
 - Fix opening of an ambiguous ref in refs view.
 - Fix search when view is loading.
 - Use the full width for diffstat in the stage view.
 - Improve escaping of variables in external commands.
 - Fix cursor behaviour during staging. (#842, #1028)
 - Fix navigation in split tree view.
 - Enable textconv in the stage view.
 - Enable textconv in the blame view and fix blame -L. (#978, #1189)
 - Update lineno for untracked files. (#1192)
 - Fix alignment of transliterated text. (#1195)
 - Fix word diff in the stage, stash and blame views. (#1207)
 - Fix reading the value of status.showUntrackedFiles. (#1211)
 - Honor commit_title:no in view settings.
 - Fix segfault with PCRE.