Add handling to modify swagger.json for Travis CI

Author: kazuhitoyokoi

.travis.yml

@@ -16,3 +16,5 @@ before_script:
   - docker pull swaggerapi/petstore
   - docker run -d -e SWAGGER_URL=http://petstore.swagger.io -e SWAGGER_BASE_PATH=/v2 -p 80:8080 swaggerapi/petstore
   - npm install -g istanbul coveralls
+  - jq '.schemes=["http"]' samples/swagger.json > samples/tmp
+  - mv samples/tmp samples/swagger.json