update pod version and jazzy docs

.travis.yml

@@ -1,5 +1,5 @@
 language: objective-c
-osx_image: xcode10
+osx_image: xcode10.2
 sudo: false
 git:
   submodules: false
@@ -24,13 +24,8 @@ env:
 before_install:
   - gem install cocoapods --no-rdoc --no-ri --no-document --quiet
   - gem install xcpretty --no-rdoc --no-ri --no-document --quiet
-  - curl -OlL "https://github.com/Carthage/Carthage/releases/download/0.26.0/Carthage.pkg"
-  - sudo installer -pkg "Carthage.pkg" -target /
-  - rm "Carthage.pkg"
   - npm install ios-sim -g
   - ios-sim start --devicetypeid "com.apple.CoreSimulator.SimDeviceType.iPhone-8, 11.0"
-before_script:
-  - carthage update --use-submodules
 script:
   - set -o pipefail
   - xcodebuild -version