update link for v1.18.20 (#155)

Author: pacoxu

README.md

@@ -16,7 +16,7 @@ Below lists the status of each release image and package and you can click any t
 |v1.21.11|[![v1.21.11-lts.1](https://img.shields.io/github/workflow/status/klts-io/kubernetes-lts/Releases%20Images/v1.21.11-lts.1?label=v1.21.11-lts.1%20Releases%20Images)](https://klts.io/docs/kubernetes/releases/v1.21/v1.21.11-lts.1/)|[![v1.21.11-lts.1](https://img.shields.io/github/workflow/status/klts-io/kubernetes-lts/Releases%20Packages/v1.21.11-lts.1?label=v1.21.11-lts.1%20Releases%20Packages)](https://klts.io/docs/kubernetes/releases/v1.21/v1.21.11-lts.1/)|
 |v1.20.15|[![v1.20.15-lts.2](https://img.shields.io/github/workflow/status/klts-io/kubernetes-lts/Releases%20Images/v1.20.15-lts.2?label=v1.20.15-lts.2%20Releases%20Images)](https://klts.io/docs/kubernetes/releases/v1.20/v1.20.15-lts.2/)|[![v1.20.15-lts.2](https://img.shields.io/github/workflow/status/klts-io/kubernetes-lts/Releases%20Packages/v1.20.15-lts.2?label=v1.20.15-lts.2%20Releases%20Packages)](https://klts.io/docs/kubernetes/releases/v1.20/v1.20.15-lts.2/)|
 |v1.19.16|[![v1.19.16-lts.3](https://img.shields.io/github/workflow/status/klts-io/kubernetes-lts/Releases%20Images/v1.19.16-lts.3?label=v1.19.16-lts.3%20Releases%20Images)](https://klts.io/docs/kubernetes/releases/v1.19/v1.19.16-lts.3/)|[![v1.19.16-lts.3](https://img.shields.io/github/workflow/status/klts-io/kubernetes-lts/Releases%20Packages/v1.19.16-lts.3?label=v1.19.16-lts.3%20Releases%20Packages)](https://klts.io/docs/kubernetes/releases/v1.19/v1.19.16-lts.3/)|
-|v1.18.20|[![v1.18.20-lts.1](https://img.shields.io/github/workflow/status/klts-io/kubernetes-lts/Releases%20Images/v1.18.20-lts.1?label=v1.18.20-lts.1%20Releases%20Images)](https://klts.io/docs/kubernetes/releases/v1.18/v1.18.20-lts.1/)|[![v1.18.20-lts.1](https://img.shields.io/github/workflow/status/klts-io/kubernetes-lts/Releases%20Packages/v1.18.20-lts.1?label=v1.18.20-lts.1%20Releases%20Packages)](https://klts.io/docs/kubernetes/releases/v1.18/v1.18.20-lts.1/)|
+|v1.18.20|[![v1.18.20-lts.2](https://img.shields.io/github/workflow/status/klts-io/kubernetes-lts/Releases%20Images/v1.18.20-lts.2?label=v1.18.20-lts.2%20Releases%20Images)](https://klts.io/docs/kubernetes/releases/v1.18/v1.18.20-lts.2/)|[![v1.18.20-lts.2](https://img.shields.io/github/workflow/status/klts-io/kubernetes-lts/Releases%20Packages/v1.18.20-lts.2?label=v1.18.20-lts.2%20Releases%20Packages)](https://klts.io/docs/kubernetes/releases/v1.18/v1.18.20-lts.2/)|
 |v1.17.17|[![v1.17.17-lts.1](https://img.shields.io/github/workflow/status/klts-io/kubernetes-lts/Releases%20Images/v1.17.17-lts.1?label=v1.17.17-lts.1%20Releases%20Images)](https://klts.io/docs/kubernetes/releases/v1.17/v1.17.17-lts.1/)|[![v1.17.17-lts.1](https://img.shields.io/github/workflow/status/klts-io/kubernetes-lts/Releases%20Packages/v1.17.17-lts.1?label=v1.17.17-lts.1%20Releases%20Packages)](https://klts.io/docs/kubernetes/releases/v1.17/v1.17.17-lts.1/)|
 |v1.16.15|[![v1.16.15-lts.1](https://img.shields.io/github/workflow/status/klts-io/kubernetes-lts/Releases%20Images/v1.16.15-lts.1?label=v1.16.15-lts.1%20Releases%20Images)](https://klts.io/docs/kubernetes/releases/v1.16/v1.16.15-lts.1/)|[![v1.16.15-lts.1](https://img.shields.io/github/workflow/status/klts-io/kubernetes-lts/Releases%20Packages/v1.16.15-lts.1?label=v1.16.15-lts.1%20Releases%20Packages)](https://klts.io/docs/kubernetes/releases/v1.16/v1.16.15-lts.1/)|
 |v1.15.12|[![v1.15.12-lts.1](https://img.shields.io/github/workflow/status/klts-io/kubernetes-lts/Releases%20Images/v1.15.12-lts.1?label=v1.15.12-lts.1%20Releases%20Images)](https://klts.io/docs/kubernetes/releases/v1.15/v1.15.12-lts.1/)|[![v1.15.12-lts.1](https://img.shields.io/github/workflow/status/klts-io/kubernetes-lts/Releases%20Packages/v1.15.12-lts.1?label=v1.15.12-lts.1%20Releases%20Packages)](https://klts.io/docs/kubernetes/releases/v1.15/v1.15.12-lts.1/)|