Add errcheck to Travis build
Add errcheck to Travis build

Neuw84/sarama,scalingdata/sarama,remerge/sarama,jimmykuo/sarama,mailgun/sarama,DataDog/sarama,kraveio/sarama,winlinvip/sarama,mailgun/sarama,VividCortex/sarama,cep21/sarama,aybabtme/sarama,vrischmann/sarama,kmiku7/sarama,remerge/sarama,uovobw/sarama,aybabtme/sarama,cep21/sarama,Shopify/sarama,crast/sarama,LastManStanding/sarama,jimmykuo/sarama,raisemarketplace/sarama,jepst/sarama,DataDog/sarama,HelixEducation/sarama,pronix/sarama,kraveio/sarama,betable/sarama,Shopify/sarama,betable/sarama,scalingdata/sarama,yangfan876/sarama,raisemarketplace/sarama,LastManStanding/sarama,kmiku7/sarama,pronix/sarama,jepst/sarama,rafrombrc/sarama,uovobw/sarama,Neuw84/sarama,winlinvip/sarama,gyroscope-innovations/legacy_sarama,gyroscope-innovations/legacy_sarama,yangfan876/sarama,crast/sarama,vrischmann/sarama,rafrombrc/sarama,VividCortex/sarama,HelixEducation/sarama