serrano v0.6.0

• query.title (query_title query filter as used here) has been removed; use query_bibliographic instead (#111)
• bump faraday to version 0.17.1 from 0.17.0 (via dependabot) (#107)
• bump json to version 2.3 from 2.2 (via dependabot) (#109)
• bump thor minimum version (via dependabot) (#110)
• better checking of filters; always check filters for proper formatting and acceptable types; improve filter tests; link to information on filters (#105) via PR from @beechnut