Update README.md

Co-authored-by: Gonzalo Muñoz <[email protected]>

Author: fjtirado

README.md

@@ -122,7 +122,7 @@ try (InputStream in = new FileInputStream("simple.yaml")) {
 
 For additional reading helper methods, including the one to read a workflow definition from classpath, check [WorkflowReader](api/src/main/java/io/serverlessworkflow/api/WorkflowReader.java) class. 
 
-#### Writing workflow definition to a a JSON/YAML target
+### Writing workflow definition to a JSON/YAML target
 
 Given a Workflow instance, you can store it using JSON or YAML format. 
 For example, to store a workflow using json format in a file called `simple.json`, you write