4.2.0

What's Changed

• Add required field use_type to Letters, Self Mailers, Postcards, and Campaigns
• chore(deps): bump guzzlehttp/guzzle from 7.4.3 to 7.4.5 by @dependabot in #155
• ignore composer.json and phpunit.xml.dist when generated by @sudoku-lord in #157
• updated PHP sdk by @sudoku-lord in #158
• Temp remove extra service by @sudoku-lord in #159
• edit addresses+bankaccs integration tests by @jho44 in #144
• regen w/o campaigns api by @jho44 in #161
• update readme + test grps of new SDK by @jho44 in #160
• regen + add identity validation by @jho44 in #162
• add campaigns api by @jho44 in #164
• docs: legacy SDK link by @jho44 in #168

Full Changelog: v4.1.0...v4.2.0