Upgrade dependencies

.travis.yml

@@ -6,10 +6,11 @@ services:
 go_import_path: github.com/awslabs/aws-lambda-container-image-converter
 
 go:
-    - 1.12.x
+    - 1.13.x
 
 script:
     - make install-deps
+    - cd img2lambda && dep ensure && cd ..
     - make
     - make integration-test
     - make stage-release-binaries

img2lambda/Gopkg.toml

@@ -1,35 +1,43 @@
 [[constraint]]
   name = "github.com/aws/aws-sdk-go"
-  version = "1.16.16"
+  version = "^1.16.16"
 
 [[constraint]]
   name = "github.com/containers/image"
   version = ">= 1.3.0, < 5.0.0"
 
 [[constraint]]
   name = "github.com/mattn/go-zglob"
-  version = "0.0.1"
+  version = "^0.0.1"
 
 [[constraint]]
   name = "github.com/mholt/archiver"
-  version = "3.1.1"
+  version = "^3.1.1"
 
 [[constraint]]
   name = "github.com/pkg/errors"
-  version = "0.8.1"
+  version = "^0.8.1"
 
 [[constraint]]
   name = "github.com/urfave/cli"
-  version = "1.20.0"
+  version = "^1.20.0"
 
 [[override]]
   name = "github.com/docker/docker"
   revision = "6e3113f700dea1bf2785d94731b4b5a1e602d9ab"
 
+[[override]]
+  name = "github.com/opencontainers/image-spec"
+  revision = "775207bd45b6cb8153ce218cc59351799217451f"
+
 [[override]]
   name = "github.com/docker/distribution"
   version = "^2.7.1"
 
+[[override]]
+  name = "github.com/russross/blackfriday"
+  version = "^1.5.2"
+
 [[constraint]]
   name = "gopkg.in/yaml.v2"
-  version = "2.2.2"
+  version = "^2.2.2"