Update dependency wpackagist-plugin/wordpress-importer to v0.8.4

This MR contains the following updates:

Package	Type	Update	Change
wpackagist-plugin/wordpress-importer (source)	require	patch	0.8.3 -> 0.8.4

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This MR has been generated by Renovate Bot.

mentioned in issue #139

added 2 commits

• d47152d9 - 1 commit from branch master
• 2f3ea596 - Update dependency wpackagist-plugin/wordpress-importer to v0.8.4

Compare with previous version

added 2 commits

• b53ed77c - 1 commit from branch master
• 91f6b229 - Update dependency wpackagist-plugin/wordpress-importer to v0.8.4

Compare with previous version