Fix some issues reported by lintian

Fix some issues reported by lintian

• Use secure URI in Homepage field. (homepage-field-uses-insecure-uri)
• Update standards version to 4.5.0, no changes needed. (out-of-date-standards-version)
• Set upstream metadata fields: Bug-Database, Bug-Submit, Repository, Repository-Browse. (upstream-metadata-file-is-missing, upstream-metadata-missing-bug-tracking, upstream-metadata-missing-repository)

This merge proposal was created automatically by the Janitor bot.

You can follow up to this merge proposal as you normally would.

Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/python-agate-excel/bb0edfd3-3db6-4f36-afff-3889f483781a.

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/share/doc/python-agateexcel-doc/html/_static/ajax-loader.gif
-rw-r--r--  root/root   /usr/share/doc/python-agateexcel-doc/html/_static/comment-bright.png
-rw-r--r--  root/root   /usr/share/doc/python-agateexcel-doc/html/_static/comment-close.png
-rw-r--r--  root/root   /usr/share/doc/python-agateexcel-doc/html/_static/comment.png
-rw-r--r--  root/root   /usr/share/doc/python-agateexcel-doc/html/_static/down-pressed.png
-rw-r--r--  root/root   /usr/share/doc/python-agateexcel-doc/html/_static/down.png
-rw-r--r--  root/root   /usr/share/doc/python-agateexcel-doc/html/_static/up-pressed.png
-rw-r--r--  root/root   /usr/share/doc/python-agateexcel-doc/html/_static/up.png

Control files of package python-agateexcel-doc: lines which differ (wdiff format)

• Built-Using: sphinx (= 2.4.3-2) 1.8.5-2~jan+lint1)
• Homepage: [-http​://agate-excel.rtfd.org/-] {+https​://agate-excel.rtfd.org/+}

Control files of package python3-agateexcel: lines which differ (wdiff format)

• Homepage: [-http​://agate-excel.rtfd.org/-] {+https​://agate-excel.rtfd.org/+}

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