REGRESSION: Docker command based scan doesn't work as described in README

[shristack]

Describe the bug

docker run -i kubesec/kubesec:v2 scan /dev/stdin < kubesec-test.yaml
$: command not found

To Reproduce
Just execute the command as described in the README Docker Usage

Expected behaviour
Should give a result in json format

Screenshots
Not required

Additional context
It works for tag 512c5e0

docker run -i kubesec/kubesec:512c5e0 scan /dev/stdin < pod-3.yaml
[
  {
    "object": "Pod/pod-3.default",
    "valid": true,
    "message": "Passed with a score of 1 points",
    "score": 1,
    "scoring": {
      "advise": [
        {
          "selector": "containers[] .securityContext .capabilities .drop",
          "reason": "Reducing kernel capabilities available to a container limits its attack surface"
        },
        {
          "selector": "containers[] .securityContext .capabilities .drop | index(\"ALL\")",
          "reason": "Drop all capabilities and add only those required to reduce syscall attack surface"
        },
        {
          "selector": "containers[] .securityContext .readOnlyRootFilesystem == true",
          "reason": "An immutable root filesystem can prevent malicious binaries being added to PATH and increase attack cost"
        },
        {
          "selector": "containers[] .resources .requests .cpu",
          "reason": "Enforcing CPU requests aids a fair balancing of resources across the cluster"
        },
        {
          "selector": "containers[] .resources .limits .cpu",
          "reason": "Enforcing CPU limits prevents DOS via resource exhaustion"
        },
        {
          "selector": "containers[] .securityContext .runAsUser -gt 10000",
          "reason": "Run as a high-UID user to avoid conflicts with the host's user table"
        },
        {
          "selector": "containers[] .resources .requests .memory",
          "reason": "Enforcing memory requests aids a fair balancing of resources across the cluster"
        },
        {
          "selector": ".metadata .annotations .\"container.seccomp.security.alpha.kubernetes.io/pod\"",
          "reason": "Seccomp profiles set minimum privilege and secure against unknown threats"
        },
        {
          "selector": "containers[] .resources .limits .memory",
          "reason": "Enforcing memory limits prevents DOS via resource exhaustion"
        },
        {
          "selector": ".metadata .annotations .\"container.apparmor.security.beta.kubernetes.io/nginx\"",
          "reason": "Well defined AppArmor policies may provide greater protection from unknown threats. WARNING: NOT PRODUCTION READY"
        },
        {
          "selector": ".spec .serviceAccountName",
          "reason": "Service accounts restrict Kubernetes API access and should be configured with least privilege"
        }
      ]
    }
  }
]