Update Mono to 5.20 (new stable) and 5.18 SR; Kill 4.x

library/mono

@@ -4,27 +4,22 @@ Maintainers: Jo Shields <[email protected]> (@directhex),
              Alexander Köplinger <[email protected]> (@akoeplinger)
 GitRepo: https://github.com/mono/docker.git
 
-Tags: 5.18.1.0, latest, 5.18.1, 5.18, 5
+Tags: 5.20.1.19, latest, 5.20.1, 5.20, 5
 Architectures: amd64, i386, arm32v7, arm32v5, arm64v8, ppc64le
-GitCommit: 3c2e39edd2bd3eb93f393b4682e41068a25df499
-Directory: 5.18.1.0
+GitCommit: 43bc89890efbb96e059cda9f690ba13c9ae8e386
+Directory: 5.20.1.19
 
-Tags: 5.18.1.0-slim, slim, 5.18.1-slim, 5.18-slim, 5-slim
+Tags: 5.20.1.19-slim, slim, 5.20.1-slim, 5.20-slim, 5-slim
 Architectures: amd64, i386, arm32v7, arm32v5, arm64v8, ppc64le
-GitCommit: 3c2e39edd2bd3eb93f393b4682e41068a25df499
-Directory: 5.18.1.0/slim
+GitCommit: bbd1369006147ff0c2363897d0e651f2efed29b0
+Directory: 5.20.1.19/slim
 
-Tags: 5.16.1.0, 5.16.1, 5.16
+Tags: 5.18.1.3, 5.18.1, 5.18
 Architectures: amd64, i386, arm32v7, arm32v5, arm64v8, ppc64le
-GitCommit: 3c2e39edd2bd3eb93f393b4682e41068a25df499
-Directory: 5.16.1.0
+GitCommit: 43bc89890efbb96e059cda9f690ba13c9ae8e386
+Directory: 5.18.1.3
 
-Tags: 5.16.1.0-slim, 5.16.1-slim, 5.16-slim
+Tags: 5.18.1.3-slim, 5.18.1-slim, 5.18-slim
 Architectures: amd64, i386, arm32v7, arm32v5, arm64v8, ppc64le
-GitCommit: 3c2e39edd2bd3eb93f393b4682e41068a25df499
-Directory: 5.16.1.0/slim
-
-Tags: 4.8.0.524, 4.8.0, 4.8, 4
-Architectures: amd64, i386, arm32v7, arm32v5
-GitCommit: 0d987d93235630e05a14983c7f87500ab33c90da
-Directory: 4.8.0.524
+GitCommit: bbd1369006147ff0c2363897d0e651f2efed29b0
+Directory: 5.18.1.3/slim