Update Kubectl to v1.18.17

Author: tasharnvb

Dockerfile

@@ -4,7 +4,7 @@ RUN apk upgrade --no-cache
 RUN apk add --no-cache ca-certificates openssl bash
 RUN update-ca-certificates
 
-RUN wget https://storage.googleapis.com/kubernetes-release/release/v1.17.9/bin/linux/amd64/kubectl \
+RUN wget https://storage.googleapis.com/kubernetes-release/release/v1.18.17/bin/linux/amd64/kubectl \
   -O /usr/bin/kubectl && chmod +x /usr/bin/kubectl
 
 COPY bin/kd_linux_amd64 /bin/kd