Make write channel bounded to avoid OOM/too much ram usage

Full Changelog: 0.1.8...0.1.9

Testing testing testing

Full Changelog: 0.1.7...0.1.8

More conservative memory usage

Full Changelog: 0.1.6...0.1.7

0.1.6 better http download and tls error handling

Full Changelog: 0.1.5...0.1.6

Fix O_DIRECT and several improvements for streaming

0.1.5

Remove unnecessary output

FLASH_COMPLETE/FAILED

0.1.4

FLASH_COMPLETE/FLASH_FAILED output

Update flags to match curl

0.1.3

Update parameters to match curl

Support request headers

0.1.2

fix http settings for longer timeout lower keepalive

0.1.1

Full Changelog: 0.1.0...0.1.1

0.1.0

Initial release for fls!