Update golang 1.11

.travis.yml

@@ -1,6 +1,6 @@
 language: go
 go:
-- 1.10.2
+- 1.11.2
 before_install:
 - sudo pip install codecov
 install:

README.md

@@ -1,7 +1,7 @@
 go-iap
 ======
 
-![](https://img.shields.io/badge/golang-1.10-blue.svg?style=flat)
+![](https://img.shields.io/badge/golang-1.11-blue.svg?style=flat)
 [![Build Status](https://travis-ci.org/awa/go-iap.svg?branch=master)](https://travis-ci.org/awa/go-iap)
 [![codecov.io](https://codecov.io/github/awa/go-iap/coverage.svg?branch=master)](https://codecov.io/github/awa/go-iap?branch=master)
 

appstore/model_test.go

@@ -33,7 +33,7 @@ func TestNumericString_UnmarshalJSON(t *testing.T) {
 		{
 			name: "object case",
 			in:   []byte("{\"ID\":{\"Num\": 8080}}"),
-			err:  errors.New("json: cannot unmarshal object into Go struct field foo.ID of type json.Number"),
+			err:  errors.New("json: cannot unmarshal object into Go value of type json.Number"),
 			out:  foo{},
 		},
 	}