Improved caching and offline support!

🐛 Bug Fix

• optimizer
  • #770 Fix postinstall failing on windows (@sebastianbenz)
• optimizer
  • #753 Fix typos in parameter documentation (@schlessera)

🚀 Enhancement

• core, optimizer
  • #747 Optimizer: cache runtime artifacts on filesystem (@sebastianbenz)
• linter
  • #755 Added og:image and alt text checks to linter for Stories (@Dbrown910)

📝 Documentation

• optimizer
  • #752 Add missing command name to CLI documentation (@matthiasrohmer)

🏠 Internal

• Other
  • #751 Update dependency rollup to v2.8.0 (@renovate-bot)
  • #749 Update dependency fetch-mock to v9.5.0 (@renovate-bot)
• lighthouse-plugin-amp, linter
  • #750 Update dependency amphtml-validator to v1.0.31 (@renovate-bot)
• optimizer
  • #748 Update dependency @ampproject/toolbox-optimizer to v2.3.1 (@renovate-bot)

Committers: 4

• Alain Schlesser (@schlessera)
• Damani (@Dbrown910)
• Matthias Rohmer (@matthiasrohmer)
• Sebastian Benz (@sebastianbenz)