Fix markdown syntax in CONTRIBUTING

CONTRIBUTING.md

@@ -25,16 +25,21 @@ Changes made to the engine can be tested locally.
 
 1. Install [the CodeClimate CLI](https://github.com/codeclimate/codeclimate).
 1. Create the image (customizing the `IMAGE_NAME` as needed):
-```bash
-IMAGE_NAME=codeclimate/codeclimate-eslint-test make image
-```
+
+   ```console
+   IMAGE_NAME=codeclimate/codeclimate-eslint-test make image
+   ```
+
 1. Add the engine to your test `.codeclimate.yml`:
-```yaml
-engines:
-  eslint-test:
-    enabled: true
-```
+
+   ```yaml
+   engines:
+     eslint-test:
+       enabled: true
+   ```
+
 1. Run analyze via the CLI:
-```bash
-codeclimate analyze --dev
-```
+
+   ```console
+   codeclimate analyze --dev
+   ```