Update README.md

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

Author: fjtirado

README.md

@@ -78,7 +78,7 @@ There are, roughly speaking, two kind of users of this SDK:
 For those ones interested on implementing their own runtime, this SDK provides an easy way to load an in memory representation of a given workflow definition.
 This memory representation consist of a hierarchy of POJOS directly generated from the Serverless Workflow specification [schema](api/src/main/resources/schema/workflow.yaml), which ensures the internal representation is aligned with the specification schema. The root of the hierarchy is `io.serverlessworkflow.api.types.Workflow` class
 
-#### Reading workflow definition from JSON/YAML source
+### Reading workflow definition from JSON/YAML source
 
 You can read a Workflow definition from JSON/YAML source: