Switch to new vendor directory layout

Fixes #113

Signed-off-by: Marcos Lilljedahl <marcosnils@gmail.com>

vendor/github.com/Azure/go-ansiterm/ground_state.go

@@ -0,0 +1,24 @@
+package ansiterm
+
+type GroundState struct {
+	BaseState
+}
+
+func (gs GroundState) Handle(b byte) (s State, e error) {
+	gs.parser.context.currentChar = b
+
+	nextState, err := gs.BaseState.Handle(b)
+	if nextState != nil || err != nil {
+		return nextState, err
+	}
+
+	switch {
+	case sliceContains(Printables, b):
+		return gs, gs.parser.print()
+
+	case sliceContains(Executors, b):
+		return gs, gs.parser.execute()
+	}
+
+	return gs, nil
+}