Use SPM test for Travis tests

Author: kolyasev

.travis.yml

@@ -5,20 +5,14 @@ env:
   global:
     - LC_CTYPE="en_US.UTF-8"
     - LANG="en_US.UTF-8"
-    - PROJECT="SwiftJSONRPC.xcodeproj"
-    - SCHEME="SwiftJSONRPC"
-    - SDK="iphonesimulator"
-    - DESTINATION="OS=13.3,name=iPhone 8"
 
 
 script:
   - set -o pipefail
 
-  - carthage bootstrap --platform iOS
-
   - xcodebuild -version
   - xcodebuild -showsdks
 
-  - xcodebuild -project "$PROJECT" -scheme "$SCHEME" -sdk "$SDK" -destination "$DESTINATION" ENABLE_TESTABILITY=YES test
+  - swift test
 
   - pod lib lint