Release 1.9.0

Author: marcprux

Sources/SkipSyntax/Version.swift

@@ -5,4 +5,4 @@
 // NOTE: this variable is updated by the `scripts/release_skip.sh` script when the version is bumped.
 
 /// The current version of Skip.
-public let skipVersion = "1.8.19"
+public let skipVersion = "1.9.0"