Pin x/sys version to fix windows build, and bump to go 1.15

.travis.yml

@@ -1,12 +1,13 @@
 language: go
 os: linux
 go:
-  - "1.14"
+  - "1.15.x"
 sudo: required
 services:
   - docker
 
 go_import_path: github.com/GoogleContainerTools/container-diff
 
 script:
+ - travis_wait make cross
  - travis_wait make test integration

go.mod

@@ -1,6 +1,8 @@
 module github.com/GoogleContainerTools/container-diff
 
-go 1.14
+go 1.15
+
+replace golang.org/x/sys => golang.org/x/sys v0.0.0-20190830141801-acfa387b8d69
 
 require (
 	code.cloudfoundry.org/bytefmt v0.0.0-20180906201452-2aa6f33b730c

go.sum

@@ -35,6 +35,7 @@ github.com/dgrijalva/jwt-go v0.0.0-20170104182250-a601269ab70c/go.mod h1:E3ru+11
 github.com/dnaeon/go-vcr v1.0.1/go.mod h1:aBB1+wY4s93YsC3HHjMBMrwTj2R9FHDzUr9KyGc8n1E=
 github.com/docker/distribution v0.0.0-20200319173657-742aab907b54 h1:wxX61VZypmXacwrj9aLDwAxAuT5kq1aq3NFc5IfbfZs=
 github.com/docker/distribution v0.0.0-20200319173657-742aab907b54/go.mod h1:Oqz4IonmMNc2N7GqfTL2xkhCQx0yS6nR+HrOZJnmKIk=
+github.com/docker/docker v0.7.3-0.20190212235812-0111ee70874a h1:r64ncoybKAgtiM9jIPurN/P+9qc1hIF78FYWe6KD7Aw=
 github.com/docker/docker v0.7.3-0.20190212235812-0111ee70874a/go.mod h1:eEKB0N0r5NX/I1kEveEz05bcu8tLC/8azJZsviup8Sk=
 github.com/docker/docker v1.4.2-0.20190219180918-740349757396 h1:XvFY2EbWlXUp7rS3wexKbH/p0KRaUJCzjWbsKdHggDQ=
 github.com/docker/docker v1.4.2-0.20190219180918-740349757396/go.mod h1:eEKB0N0r5NX/I1kEveEz05bcu8tLC/8azJZsviup8Sk=
@@ -209,6 +210,8 @@ golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190801041406-cbf593c0f2f3 h1:4y9KwBHBgBNwDbtu44R5o1fdOCQUEXhbk/P4A9WmJq0=
 golang.org/x/sys v0.0.0-20190801041406-cbf593c0f2f3/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190830141801-acfa387b8d69 h1:Wdn4Yb8d5VrsO3jWgaeSZss09x1VLVBMePDh4VW/xSQ=
+golang.org/x/sys v0.0.0-20190830141801-acfa387b8d69/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191120155948-bd437916bb0e h1:N7DeIrjYszNmSW409R3frPPwglRwMkXSBzwVbkOjLLA=
 golang.org/x/sys v0.0.0-20191120155948-bd437916bb0e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=