Bump MacroExpress requirement to 0.0.4

Required to run via swift-sh.

Author: helje5

Sources/connect-static/main.swift

@@ -1,7 +1,7 @@
 #!/usr/bin/swift sh
 
 import Foundation
-import MacroExpress // @Macro-swift ~> 0.0.3
+import MacroExpress // @Macro-swift ~> 0.0.4
 
 let dirname = __dirname()
 

Sources/express-simple/main.swift

@@ -1,6 +1,6 @@
 #!/usr/bin/swift sh
 
-import MacroExpress // @Macro-swift          ~> 0.0.3
+import MacroExpress // @Macro-swift          ~> 0.0.4
 import cows         // @AlwaysRightInstitute ~> 1.0.0
 
 let app = express()