updated readme with expected output

README.md

@@ -179,9 +179,9 @@ cp -r ./examples/config.json ./workspace/phen
 acmc phen validate
 ```
 
-	Expected Output:
+Expected Output:
 
-	Once the command is executed, you should see output similar to this:
+Once the command is executed, you should see output similar to this:
 
 ```bash
 [INFO] - Validating phenotype: <path>/concepts-processing/workspace/phen