use go 1.11 in travis

Signed-off-by: Ivan Porto Carrero <ivan@flanders.co.nz>

Author: casualjim

.travis.yml

@@ -1,18 +1,18 @@
-language: go
+after_success:
+- bash <(curl -s https://codecov.io/bash)
 go:
-- 1.7
-- 1.8
-- 1.9
+- '1.9'
+- 1.10.x
+- 1.11.x
 install:
 - go get -u github.com/stretchr/testify
 - go get -u github.com/go-openapi/swag
 - go get -u gopkg.in/yaml.v2
 - go get -u github.com/go-openapi/jsonpointer
 - go get -u github.com/go-openapi/jsonreference
-script:
-- go test -v -race -cover -coverprofile=coverage.txt -covermode=atomic ./...
-after_success:
-- bash <(curl -s https://codecov.io/bash)
+language: go
 notifications:
   slack:
     secure: 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
+script:
+- go test -v -race -cover -coverprofile=coverage.txt -covermode=atomic ./...