added travis-ci build status to README.md
added travis-ci build status to README.md

HITS-SDBV/nmtrypi-seek,aina1205/nmtrypi-seek,HITS-SDBV/nmtrypi-seek,HITS-SDBV/nmtrypi-seek,aina1205/nmtrypi-seek,aina1205/nmtrypi-seek,HITS-SDBV/nmtrypi-seek,aina1205/nmtrypi-seek