Update impl/README.md

Co-authored-by: Ricardo Zanini <[email protected]>

Author: fjtirado

impl/README.md

@@ -102,7 +102,7 @@ We are going to show two ways of invoking the workflow:
   - blocking the thread till the get request goes through
   - returning control to the caller, so the main thread continues while the get is executed
 
-In order to execute the workflow, blocking the thread till the http request is completed, you should write
+In order to execute the workflow, blocking the thread till the HTTP request is completed, you should write
 
 ``` java 
 try (WorkflowApplication appl = WorkflowApplication.builder().build()) {