Try to make it compile on Linux via compiler directive

Author: Sebastian Fichtner

Code/CombineObserver/SwiftObserver+Combine.swift

@@ -1,3 +1,5 @@
+#if canImport(Combine)
+
 import Combine
 import SwiftObserver
 
@@ -61,3 +63,5 @@ public class PublisherOnObservable<O: SwiftObserver.ObservableObject>: Publisher
     public typealias Output = O.Message
     public typealias Failure = Never
 }
+
+#endif

README.md

@@ -78,7 +78,7 @@ let package = Package(
     dependencies: [
         .package(
             url: "https://github.com/codeface-io/SwiftObserver.git",
-            exact: "7.0.1"
+            exact: "7.0.3"
         )
     ],
     targets: [