Update go version used from 1.10.2 to 1.11.2 to match one used by k8s

.travis.yml

@@ -6,7 +6,7 @@ services:
 language: go
 
 go:
-  - 1.10.2
+  - 1.11.2
 
 before_install:
   - sudo apt-get install libseccomp-dev -qq

builder/Dockerfile

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM golang:1.10.2
+FROM golang:1.11.2
 LABEL maintainer="Marcin Wielgus <mwielgus@google.com>"
 
 ENV GOPATH /gopath/

hack/check-go-version.sh

@@ -18,7 +18,7 @@ set -euo pipefail
 
 GO_VERSION=($(go version))
 
-if ! echo "${GO_VERSION[2]}" | grep -Eq 'go1.9|1.10'; then
+if ! echo "${GO_VERSION[2]}" | grep -Eq 'go1.9|1.10|1.11'; then
   echo "Unsupported go version ${GO_VERSION}"
   return 1
 fi