Fix travis CI script to only build Carthage. Swift cli build can not works on Objective-C code import syntax, but works on Xcode

Author: dreampiggy

.travis.yml

@@ -33,4 +33,5 @@ script:
   - pod install --project-directory=Example
   - xcodebuild build -workspace Example/SDWebImageSwiftUI.xcworkspace -scheme SDWebImageSwiftUIDemo -sdk iphonesimulator -destination 'name=iPhone 8' ONLY_ACTIVE_ARCH=NO | xcpretty -c
 
-  - swift build
+  - carthage update --platform iOS
+  - xcodebuild build -project SDWebImageSwiftUI.xcodeproj -scheme 'SDWebImageSwiftUI' -sdk iphonesimulator -configuration Debug | xcpretty -c

Cartfile.resolved

@@ -1 +1 @@
-github "SDWebImage/SDWebImage" "5.1.0"
+github "SDWebImage/SDWebImage" "5.2.3"

Package.swift

@@ -33,7 +33,6 @@ let package = Package(
             name: "SDWebImageSwiftUIObjC",
             dependencies: ["SDWebImage"],
             path: "SDWebImageSwiftUI/Classes/ObjC",
-            sources: ["SDAnimatedImageInterface.h", "SDAnimatedImageInterface.m"],
             publicHeadersPath: "."
         )
     ]