Update library/swift

Co-Authored-By: yosifkit <[email protected]>

library/swift

@@ -19,7 +19,7 @@ Tags: 5.1.1-slim, 5.1-slim, 5.1.1-bionic-sim, 5.1-bionic-slim, bionic-slim, slim
 GitCommit: 4ac33ae94bcd05bb0d5ae851d6be63264f0b9c27
 Directory: 5.1/ubuntu/18.04/slim
 
-Tags: 5.1.1-xenial-sim, 5.1-xenial-slim, xenial-slim
+Tags: 5.1.1-xenial-slim, 5.1-xenial-slim, xenial-slim
 GitCommit: 4ac33ae94bcd05bb0d5ae851d6be63264f0b9c27
 Directory: 5.1/ubuntu/16.04/slim