Update README.md

Author: jonathancadepowers

README.md

@@ -73,7 +73,7 @@ the data via `curl`:
 ```yaml
 after_script:
   - CODECLIMATE_REPO_TOKEN="..." bin/test-reporter --stdout > codeclimate.json
-  - curl -X POST -d @codeclimate.json -H 'Content-Type: application/json' -H 'User-Agent: Code Climate (PHP Test Reporter v0.1.1)' https://codeclimate.com/test_reports
+  - "curl -X POST -d @codeclimate.json -H 'Content-Type: application/json' -H 'User-Agent: Code Climate (PHP Test Reporter v0.1.1)' https://codeclimate.com/test_reports"
 ```
 
 More details can be found in [this issue][issue].