0.12.0

Features

• new macro begin* that run their arguments in parallel if they async
• add typecheck to rest of the functions
• new real? and pluck functions
• stack trace for exceptions

Bug fixes

• fix find and filter to check if function from argument return nil
• fix accessing FileReader object (try to copy read only prototype)
• fix parser error when parsing symbol macros #10
• fix undefined values in macro with missing arguments #11
• fix macroexpand #9
• fix line breaking in S-Expression Formatter