Adding in 'edn-env-var' reader macro
Bumping to SNAPSHOT
Updating the README with the new reader macro
Bumping README version to 0.6.2, and updating the Changelog
Using EDN's read-string rather than Clojure's
Error handling in edn-env-var
Refactoring edn-env-var

Extracting to a fn, and adding note about returning nil
Bumping to 0.6.2 stable
Merge branch 'edn-env-var'