exon-0.1.0.0: Changelog.md

# 0.2.1.0
* add naive stderr interpreters for `DataLog` and `Log`.

# 0.2.0.0

* `DataLog` got a second constructor, `Local`. It takes a higher-order `Sem` and a transformation function, the latter
  of which is applied to all messages logged within the former.
  This allows context manipulation for blocks of code.
* `interceptDataLogConc` adds support for concurrent processing of log messages to any interpretation of `DataLog`.