Continuing 0.5.0.
Fix #522: Update readme
Fix #563: Prevent Closure from eliminating finally
Merge pull request #666 from gzm0/update-readme

Fix #522: Update readme
Fix #604: Add option to optimizer to not un-cache
Merge pull request #668 from gzm0/finally

Fix #563: Prevent Closure from eliminating finally
Merge pull request #669 from gzm0/no-uncache

Fix #604: Add option to optimizer to not un-cache