fix: unexported field should be ignored

.travis.yml

@@ -1,6 +1,8 @@
 language: go
 go:
+  - "1.9.x"
   - "1.10.x"
+  - "1.11.x"
 install:
   - go get -u github.com/golang/dep/cmd/dep
 before_script:

container.go

@@ -95,6 +95,12 @@ func (container Container) Connect(val interface{}, id ...string) {
 
 	for i := 0; i < rt.NumField(); i++ {
 		sf := rt.Field(i)
+
+		// skip unexported field
+		if sf.Name[0] >= 'a' && sf.Name[0] <= 'z' {
+			continue
+		}
+
 		if tval, ok := sf.Tag.Lookup(tag); ok {
 
 			if tval == "-" {

go.mod

@@ -0,0 +1,7 @@
+module github.com/Fs02/wire
+
+require (
+	github.com/davecgh/go-spew v1.1.0
+	github.com/pmezard/go-difflib v1.0.0
+	github.com/stretchr/testify v1.2.2
+)

go.sum

@@ -0,0 +1,6 @@
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/testify v1.2.2 h1:bSDNvY7ZPG5RlJ8otE/7V6gMiyenm9RtJ7IUVIAoJ1w=
+github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=

wire_test.go

@@ -14,6 +14,7 @@ type Valuer interface {
 type ComponentA struct {
 	Value1 string
 	Value2 int
+	value3 interface{} // unexported
 }
 
 func (c ComponentA) Value() string {