Compliancy fixes for String#center
Compliancy fixes for String#center

opal/opal,c42engineering/opal,opal/opal,Mogztter/opal,gabrielrios/opal,bbatsov/opal,catprintlabs/opal,bbatsov/opal,wied03/opal,castwide/opal,gausie/opal,merongivian/opal,jgaskins/opal,jgaskins/opal,Mogztter/opal,iliabylich/opal,jannishuebl/opal,c42engineering/opal,castwide/opal,suyesh/opal,Ajedi32/opal,domgetter/opal,Mogztter/opal,fazibear/opal,wied03/opal,iliabylich/opal,castwide/opal,bbatsov/opal,jgaskins/opal,jannishuebl/opal,merongivian/opal,jannishuebl/opal,iliabylich/opal,kachick/opal,gausie/opal,opal/opal,merongivian/opal,Flikofbluelight747/opal,gausie/opal,opal/opal,Ajedi32/opal,gabrielrios/opal,domgetter/opal,kachick/opal,catprintlabs/opal,suyesh/opal,catprintlabs/opal,kachick/opal,kachick/opal,wied03/opal,Flikofbluelight747/opal,suyesh/opal,Ajedi32/opal,Mogztter/opal,gabrielrios/opal,fazibear/opal,Flikofbluelight747/opal,c42engineering/opal,fazibear/opal