Bump versions and add jq

Dockerfile

-FROM bitnami/kubectl:1.20.2 AS kubectl
+FROM bitnami/kubectl:1.21.5 AS kubectl
 
-FROM amazon/aws-cli:2.1.26
+FROM amazon/aws-cli:2.2.47
 ENTRYPOINT []
+RUN yum install -y jq && \
+    yum clean all && \
+    rm -rf /var/cache/yum
 COPY --from=kubectl /opt/bitnami/kubectl/bin/kubectl /usr/local/bin/kubectl

README.md

 # AWS Kubectl
 
-An image that provides both the AWS CLI and [kubectl](https://kubernetes.io/docs/reference/kubectl/overview/) tool. 
+An image that provides both the AWS CLI and [kubectl](https://kubernetes.io/docs/reference/kubectl/overview/) tool. Also includes jq. 
 
 ## Use Cases