provide JSZip after pptx generation

• Merge pull request #50 from singerla/feature-output-stream e6e332e
• feature(output): getJSZip to create more output variants, e.g. generateAsync 03a6411
• feature(output): pass options to stream(); add to README.md 28c6c45
• feature(output): add stream example to dev.ts 4df2e49
• feature(output): create readable stream from output file instead of writing to disk (WIP) cd0d35d
• Merge pull request #48 from singerla/feature-cache 0944a39
• Merge pull request #47 from singerla/main a1362aa
• chore(deps): bump versions; remove lodash 5c4a8f1
• refactor(archive): use jszip to compress fs created folder afde8db
• refactor(archive): switch types fs / jszip (wip) 9ac27b8
• Merge pull request #44 from singerla/main 49d5529

v0.2.1...v0.2.2