Release v2.3.4.2

Changes

• Upgrade haskell-build orb version by @newhoggy
• Upgrade to haskell-build-4.0.1 by @newhoggy
• Upgrade to haskell-build-4.0.2 by @newhoggy
• Bump upper-bound of optparse-applicative by @newhoggy
• Relax lower bound on containers by @newhoggy
• Upgrade generic-lens version by @newhoggy
• Fixes to compile and test with ghc-8.8.1 by @newhoggy
• Add ghc-8.8.1 to CI by @newhoggy
• New version 2.3.4.2 by @newhoggy