Preparing for 0.21 release

[rhuss]

Includes update to go 1.15 and alignment of dependencies for kn 0.21

/hold until pkg-source is released (remove the last replace in go.mod then)

[rhuss]

/hold

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[dsimansk]

@googlebot I consent.

[codecov[bot]]

Codecov Report

Merging #44 (c1f8e1e) into master (a1036dd) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #44   +/-   ##
=======================================
  Coverage   79.98%   79.98%           
=======================================
  Files          20       20           
  Lines        1029     1029           
=======================================
  Hits          823      823           
  Misses        147      147           
  Partials       59       59           

---

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[dsimansk]

/retest

[dsimansk]

@rhuss one of the assert seems to failing due to different error format. Do you mind if I push one more commit?

[dsimansk]

@rhuss and test setup needs update too. https://github.com/knative-sandbox/kn-plugin-admin/blob/master/test/e2e-tests.sh#L25-L26

[rhuss]

@rhuss one of the assert seems to failing due to different error format. Do you mind if I push one more commit?

go ahead !

[rhuss]

/lgtm

[knative-prow-robot]

@rhuss: you cannot LGTM your own PR.

In response to [this](https://github.com/knative-sandbox/kn-plugin-admin/pull/44#issuecomment-785263474): >/lgtm Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[rhuss]

@dsimansk sorry, forget to answer: If you can quickly fix the assertions, that would be great (and push then). Otherwise I can do it later, too

[rhuss]

/lgtm /approve

[knative-prow-robot]

@rhuss: you cannot LGTM your own PR.

In response to [this](https://github.com/knative-sandbox/kn-plugin-admin/pull/44#issuecomment-785289271): >/lgtm >/approve Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[navidshaikh]

/lgtm

[dsimansk]

/unhold

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dsimansk, mattmoor, maximilien, rhuss

The full list of commands accepted by this bot can be found here.

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/knative-sandbox/kn-plugin-admin/blob/master/OWNERS)~~ [mattmoor,maximilien,rhuss] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment