add dev-2.0-core to the travis regimin
add dev-2.0-core to the travis regimin

pattern-lab/patternlab-node,geoffp/patternlab-node,stevemartin/patternlab-node,pattern-lab/patternlab-node,stevemartin/patternlab-node,geoffp/patternlab-node,pattern-lab/patternlab-node,pattern-lab/patternlab-node