Fix: Fatal error: length > 1 in coercion to logical

release 1.7.0

release 1.6.2

Fix: no visible global function definition for 'is'

update version

Implement proper error handling

Fix: Error in log$info(" ! shift/reduce conflict ...

Fix: could not find function "appender.console".

You can define literals as a string of characters

e.g.: literals = ':;,=*{}()<>[]'.

Declare Depends: R (>= 3.3.0) in DESCRIPTION file.