diff --git a/.travis.yml b/.travis.yml
index 1d4b500..c870af6 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,5 @@
 language: go
 go:
-- 1.6.4
 - 1.7.5
 - 1.8.1
 install:
@@ -9,6 +8,11 @@ install:
 - go get github.com/rogpeppe/fastuuid
 - go get golang.org/x/net/context
 - go get gopkg.in/mgo.v2
+- go get github.com/fsnotify/fsnotify
+- go get github.com/go-gomail/gomail
+- go get go.uber.org/zap
+- go get github.com/cockroachdb/cmux
+- go get github.com/gorilla/mux
 - go get github.com/smartystreets/goconvey/convey
 before_script:
 - go vet -x ./...
diff --git a/README.md b/README.md
index cb1a760..3903892 100644
--- a/README.md
+++ b/README.md
@@ -47,7 +47,7 @@
 
 ### Setup / installation
 
-Building with the source
+Building with the source, require go >= 1.7+
 
 ```
 go get -u github.com/shunfei/cronsun
diff --git a/node/cron/parser_test.go b/node/cron/parser_test.go
index 1de595f..099110e 100644
--- a/node/cron/parser_test.go
+++ b/node/cron/parser_test.go
@@ -186,7 +186,7 @@ func TestParse(t *testing.T) {
 			t.Errorf("%s => unexpected error %v", c.expr, err)
 		}
 		if !reflect.DeepEqual(actual, c.expected) {
-			t.Errorf("%s => expected %b, got %b", c.expr, c.expected, actual)
+			t.Errorf("%s => expected %v, got %v", c.expr, c.expected, actual)
 		}
 	}
 }
@@ -224,7 +224,7 @@ func TestStandardSpecSchedule(t *testing.T) {
 			t.Errorf("%s => unexpected error %v", c.expr, err)
 		}
 		if !reflect.DeepEqual(actual, c.expected) {
-			t.Errorf("%s => expected %b, got %b", c.expr, c.expected, actual)
+			t.Errorf("%s => expected %v, got %v", c.expr, c.expected, actual)
 		}
 	}
 }