update yaml format

DOCS.md

@@ -13,19 +13,21 @@ This plugin can scan your code quality and post the analysis report to your Sona
 The below pipeline configuration demonstrates simple usage:
 
 ```yaml
-  code-analysis:
-    image: aosapps/drone-sonar-plugin
-    settings:
-        sonar_host:
-          from_secret: sonar_host
-        sonar_token:
-          from_secret: sonar_token
+steps
+- name: code-analysis
+  image: aosapps/drone-sonar-plugin
+  settings:
+      sonar_host:
+        from_secret: sonar_host
+      sonar_token:
+        from_secret: sonar_token
 ```
 
 Customized parameters could be specified:
 
 ```diff
-  code-analysis:
+  steps
+  - name: code-analysis
     image: aosapps/drone-sonar-plugin
     settings:
         sonar_host:

README.md

@@ -23,12 +23,12 @@ docker run --rm \
 
 ### Pipeline example
 ```yaml
-  code-analysis:
-    image: aosapps/drone-sonar-plugin
-    settings:
-        sonar_host:
-          from_secret: sonar_host
-        sonar_token:
-          from_secret: sonar_token
+steps
+- name: code-analysis
+  image: aosapps/drone-sonar-plugin
+  settings:
+      sonar_host:
+        from_secret: sonar_host
+      sonar_token:
+        from_secret: sonar_token
 ```
-