fix-licensing-to-better-support-perpetual

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from https://bitbucket.org/ndunn/instant-search-archive/issues/60/

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https://community.atlassian.com/t5/Confluence-questions/Renewal-license-for-plugins-expiration-behaviour-in-marketplace/qaq-p/281918

1. license should not expire, but indicate that there is an update after one year instead that there is no license for

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