add travis file

Author: skywinder

.travis.yml

@@ -0,0 +1,11 @@
+language: objective-c
+osx_image: xcode10
+xcode_project: web3swift.xcworkspace # path to your xcodeproj folder
+xcode_scheme: web3swift-iOS
+xcode_destination: platform=iOS Simulator, OS=12.0, name=iPhone X
+before_install:
+  - gem install cocoapods --pre --no-rdoc --no-ri --no-document --quiet
+script:
+  - xcodebuild -scheme web3swift-iOS -workspace web3swift.xcworkspace -sdk iphonesimulator build test
+after_success:
+  - bash <(curl -s https://codecov.io/bash)