chore: add coverage ignore settings
chore: add coverage ignore settings

c3js/c3,alanhamlett/c3,c3js/c3,Aloomaio/c3,Aloomaio/c3,masayuki0812/c3,alanhamlett/c3,masayuki0812/c3,alanhamlett/c3,c3js/c3,c3js/c3