Fix the style of trailing closures

Put parentheses around the functional trailing closures

Author: ViktorSimko

Sources/Xcodeproj/generate().swift

@@ -98,7 +98,7 @@ public func generate(
     if try repositoryProvider.checkoutExists(at: srcroot) {
         // Get the ignored files and exclude them
         let repository = try repositoryProvider.openCheckout(at: srcroot)
-        extraFiles = try extraFiles.filter { try !repository.isIgnored($0) }
+        extraFiles = try extraFiles.filter({ try !repository.isIgnored($0) })
     }
 
     /// Generate the contents of project.xcodeproj (inside the .xcodeproj).
@@ -250,11 +250,11 @@ func generateSchemes(
 func findNonSourceFiles(path: AbsolutePath, recursively: Bool = false) throws -> [AbsolutePath] {
     let filesFromPath = try walk(path, recursively: recursively)
 
-    return filesFromPath.filter {
+    return filesFromPath.filter({
         if !isFile($0) { return false }
         if let `extension` = $0.extension, SupportedLanguageExtension.validExtensions.contains(`extension`) {
             return false
         }
         return true
-    }
+    })
 }