Update repository config (#133)

/cherry-pick

Signed-off-by: 1gtm <1gtm@appscode.com>

Author: 1gtm

.github/workflows/ci.yml

@@ -45,7 +45,7 @@ jobs:
     needs: build
     strategy:
       matrix:
-        k8s: [v1.14.10, v1.15.11, v1.16.9, v1.17.5, v1.18.8, v1.20.0]
+        k8s: [v1.14.10, v1.15.11, v1.16.9, v1.17.5, v1.18.8, v1.19.4, v1.20.0]
     steps:
       - uses: actions/checkout@v1