Regenerate gemspec for version 1.13.0
Regenerate gemspec for version 1.13.0

reshleman/roo,salsify/roo,stevendaniels/roo,roo-rb/roo,culturecode/roo,visagio/roo,airblade/roo,pricematch/roo-legacy,fabien-michel/roo,pricematch/roo-legacy,thotmx/roo,pabloh/roo,enemycnt/roo,RobertRehberg/roo,myplaceonline/roo,maruware/roo,pricematch/roo-legacy,xchanging-mm4/roo,malept/roo