v0.12.5

General improvements

• added joker.time/parse and joker.time/add-date functions (thanks @mrichards42!)
• fixed and improved stdin handling in joker.os/exec (thanks @rwstauner and @jcburley!)
• ex-message now works with built-in errors
• added joker.os/exists? function

Linter improvements

• recognize ClojureScript global type symbols
• recognize second arity in read-string
• added :unused-keys rule (see #240 for details)

Fixes

• fixed ex-cause for nil case