Update go dependencies

vendor/gopkg.in/gavv/httpexpect.v2/chain.go

@@ -0,0 +1,38 @@
+package httpexpect
+
+type chain struct {
+	reporter Reporter
+	failbit  bool
+}
+
+func makeChain(reporter Reporter) chain {
+	return chain{reporter, false}
+}
+
+func (c *chain) failed() bool {
+	return c.failbit
+}
+
+func (c *chain) fail(message string, args ...interface{}) {
+	if c.failbit {
+		return
+	}
+	c.failbit = true
+	c.reporter.Errorf(message, args...)
+}
+
+func (c *chain) reset() {
+	c.failbit = false
+}
+
+func (c *chain) assertFailed(r Reporter) {
+	if !c.failbit {
+		r.Errorf("expected chain is failed, but it's ok")
+	}
+}
+
+func (c *chain) assertOK(r Reporter) {
+	if c.failbit {
+		r.Errorf("expected chain is ok, but it's failed")
+	}
+}