Item::getSiteLinkList() was added and Item::getSiteLinks() deprecated in
version 0.8.0 (2014-06-05) of the Wikibase data model, and the
deprecated method was finally removed in version 8.0.0 (2018-08-03).

Instead of assuming that all entities are in namespace 0 (which is only
true in a Wikidata-like installation, but not in a default Wikibase
installation, and even then only for items, not properties), take the
actual namespace of the requested entity from an injected
EntityNamespaceLookup.

Also, if we can’t find the entity, throw an exception instead of
returning count 0: it’s better to fail the import than to duplicate
statements.

Fixes #22.

If the import script is run from the command line, there is no session,
and the edit is still credited to 127.0.0.1. However, if there is a
session – for example, if the import is run from a special page (#25) –
this ensures that the correct user is used.

MediaWiki and Wikibase no longer support PHP 5.5.

Test on PHP 7 in Travis

Wikibase data model updates

Search entities in the correct namespace

Initialize user from session

Bug: T277313
Depends-On: Ief409a501aac74e7b6df4e440113cd552dba3c74

This is required when using this extension with MediaWiki 1.36. None of
the breaking changes in Monolog 2.0.0 should affect this extension, as
far as I can tell.

Declare compatibility with Monolog v2

Update WikibaseRepo::getEntityNamespaceLookup() call