[Swift] Add Swift 5.1 Docker images and remove Swift 3.x Docker images

library/swift

@@ -7,6 +7,22 @@ Maintainers: Ted Kremenek <[email protected]> (@tkremenek),
 GitRepo: https://github.com/apple/swift-docker.git
 
 
+Tags: 5.1, 5.1-bionic, bionic, latest
+GitCommit: fd1691a1f73b68fb8c8ef6072e716892be54a3d2
+Directory: 5.1/ubuntu/18.04
+
+Tags: 5.1-xenial, xenial
+GitCommit: fd1691a1f73b68fb8c8ef6072e716892be54a3d2
+Directory: 5.1/ubuntu/16.04
+
+Tags: 5.1-slim, 5.1-bionic-slim, bionic-slim, slim
+GitCommit: fd1691a1f73b68fb8c8ef6072e716892be54a3d2
+Directory: 5.1/ubuntu/18.04/slim
+
+Tags: 5.1-xenial-slim, xenial-slim
+GitCommit: fd1691a1f73b68fb8c8ef6072e716892be54a3d2
+Directory: 5.1/ubuntu/16.04/slim
+
 Tags: 5.0.3, 5.0, 5.0.3-bionic, 5.0-bionic, bionic, latest
 GitCommit: 78d0a2dde09af579d06e2114a101fd90b01fbfb0
 Directory: 5.0/ubuntu/18.04
@@ -34,7 +50,3 @@ Directory: 4.1
 Tags: 4.0.3, 4.0
 GitCommit: 34aa283f9b3473ab22b2282f71773781b121af19
 Directory: 4.0
-
-Tags: 3.1.1, 3.1, 3
-GitCommit: 34aa283f9b3473ab22b2282f71773781b121af19
-Directory: 3.1