Update .travis.yml
Update .travis.yml

Added additional ruby version to travis matrix, to increase chance of running to completion
HITS-SDBV/nmtrypi-seek,HITS-SDBV/seek,HITS-SDBV/nmtrypi-seek,HITS-SDBV/seek,aina1205/nmtrypi-seek,HITS-SDBV/seek,Virtual-Liver-Network/seek,Virtual-Liver-Network/seek,Virtual-Liver-Network/seek,aina1205/nmtrypi-seek,stuzart/seek,HITS-SDBV/nmtrypi-seek,HITS-SDBV/nmtrypi-seek,SynthSys/seek,SynthSys/seek,Virtual-Liver-Network/seek,SynthSys/seek,stuzart/seek,aina1205/nmtrypi-seek,aina1205/nmtrypi-seek,SynthSys/seek,HITS-SDBV/seek,stuzart/seek