Fix some issues reported by lintian

Fix some issues reported by lintian

• Bump debhelper from old 12 to 13. (package-uses-old-debhelper-compat-version)
• Drop transition for old debug package migration. (debug-symbol-migration-possibly-complete)
• Update standards version to 4.6.1, no changes needed. (out-of-date-standards-version)
• Update standards version to 4.6.2, no changes needed. (out-of-date-standards-version)

Debdiff

These changes affect the binary packages:

[The following lists of changes regard files as different if they have different names, permissions or owners.]

Files in second set of .debs but not in first

-rw-r--r--  root/root   /usr/lib/debug/.build-id/90/01c4bd11586ea21adfe45efb36407b08360241.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/c3/7c4ff9c1e76a71c45b668eeb3045197942093a.debug

No differences were encountered between the control files of package **libtelepathy-logger-qt-dev**

No differences were encountered between the control files of package **libtelepathy-logger-qt5**

Control files of package libtelepathy-logger-qt5-dbgsym: lines which differ (wdiff format)

• Breaks: libtelepathy-logger-qt-dbg (<< 17.08.0~)
• Build-Ids: c37c4ff9c1e76a71c45b668eeb3045197942093a 9001c4bd11586ea21adfe45efb36407b08360241
• Replaces: libtelepathy-logger-qt-dbg (<< 17.08.0~)

You can also view the diffoscope diff (unfiltered).

This merge proposal was created by the Janitor bot, and it will automatically rebase or close this proposal as appropriate when the target branch changes. Any comments you leave here will be read by the Janitor's maintainers.

Build and test logs for this branch can be found at https://janitor.debian.net/run/2d2aaca4-09f2-43de-a215-7217fef327d6.