[build] add coverity scan to .travis.yml
[build] add coverity scan to .travis.yml

tstack/lnav,sureshsundriyal/lnav,acleasby/lnav,acleasby/lnav,acleasby/lnav,tstack/lnav,sureshsundriyal/lnav,acleasby/lnav,tstack/lnav,sureshsundriyal/lnav,tstack/lnav,sureshsundriyal/lnav,acleasby/lnav