Update README.md

Merge pull request tellerops#22 from SpectralOps/yaml-export

add yaml+json export

Merge pull request tellerops#16 from SpectralOps/implement-write

First stage of implementing write -- add drift

add redact

Merge pull request tellerops#7 from derektamsen/fix/doc-child-process…

…-flags-not-passed

Fix teller run child process docs to pass flags

pre/post file creation cmds

open sourcing teller! 🎊

open sourcing teller! 🎊