Log Message:
tig: update to 2.5.5.

tig-2.5.5
---------

Improvements:

 - Make word-diff a toggleable option. (#1119, #1125)
 - Add Linux installation instructions. (#1121, #1126)
 - Allow :back to work across separate blame views. (#1123, #1127)
 - Add auto-refresh to log view. (#1128)
 - Expose `%(file_old)`, useful for deleted and renamed files. (#1132)
 - Enable jumping back in main view. (#628, #1138)
 - Add PCRE (Perl Compatible Regular Expressions) support. (#1137, #1143)
 - Pass command line args through to diff-files in status view. (#1152, #1155)
 - Remove quotes from TIG_LS_REMOTE to allow inline shell commands. (#1160, #1161)
 - Avoid pushing identical history state in main view.
 - Replace useless strncpy to avoid compilation warning with GCC 8.
 - Update utf8proc to v2.7.0.
 - Update distclean rule to preserve tarball contents. (#1167, #1169)
 - Add reference types stash and other. (#1160, #1172)
 - Auto refresh view upon option change.
 - Allow to toggle revision filtering. (#1173)

Bug fixes:

 - Fix null dereferences on unset format strings. (#1136, #1159)
 - Fix invalid read in log_read. (#1128)
 - Restore support for tig log --graph. (#1128)
 - Further fix to fullscreen navigation.
 - Fix blame when opened from an initial diff view. (#1135)
 - Fix stash view when using tig --all or tig revs. (#1146, #1147)
 - Avoiding null pointer dereference. (#1096)
 - Fix navigation between chunks after splitting chunk. (#1101, #1162)
 - Fix status line when toggling general options. (#1163, #1164)
 - Honor reference-format = hide:tag in diff view. (#1168, #1170)
 - Fix crash on :toggle file-args.