changed git URL formats

Author: guness

bitrise.yml

@@ -7,8 +7,8 @@ app:
   - SAMPLE_APP_IOS: https://github.com/bitrise-io/sample-apps-ios-simple-objc.git
   - BITRISE_STEP_ID: firebase-app-distribution
   - BITRISE_STEP_VERSION: 0.1.0
-  - BITRISE_STEP_GIT_CLONE_URL: https://github.com/guness/bitrise-step-firebase-app-distribution.git
-  - MY_STEPLIB_REPO_FORK_GIT_URL: https://github.com/guness/bitrise-steplib.git
+  - BITRISE_STEP_GIT_CLONE_URL: git@github.com:guness/bitrise-step-firebase-app-distribution.git
+  - MY_STEPLIB_REPO_FORK_GIT_URL: git@github.com:guness/bitrise-steplib.git
   - FIREBASE_CI_TOKEN: $FIREBASE_CI_TOKEN
   - FIREBASE_APP_ID_ANDROID: $FIREBASE_APP_ID_ANDROID
   - FIREBASE_APP_ID_IOS: $FIREBASE_APP_ID_IOS