Fix some issues reported by lintian

Fix some issues reported by lintian

• debian/watch: Use GitHub /tags rather than /releases page.

• Fix day-of-week for changelog entry 0.3.5-2. (debian-changelog-has-wrong-day-of-week)

• Update standards version to 4.6.1, no changes needed. (out-of-date-standards-version)

This merge proposal was created automatically by the Janitor bot. For more information, including instructions on how to disable these merge proposals, see https://janitor.debian.net/lintian-fixes.

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/sniffit/f339f298-c1c4-48d2-ae61-4f564a45bd1f.

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/dc/d51aa742c9aea808e7583a411a6d3d34ac4e8c.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/eb/fa271faf19f955069d3cd422c65b4b88a3c6af.debug

No differences were encountered between the control files of package **sniffit**

Control files of package sniffit-dbgsym: lines which differ (wdiff format)

• Build-Ids: ebfa271faf19f955069d3cd422c65b4b88a3c6af dcd51aa742c9aea808e7583a411a6d3d34ac4e8c

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