Added an other variable name to example

Author: avara1986

examples/mininum_microservice/config.yml

@@ -1,2 +1,2 @@
-my-ms:
+my-minimal-microservice:
   APP_NAME: "Python Microservice"

examples/mininum_microservice/main.py

@@ -3,7 +3,7 @@
 from pyms.flask.app import Microservice
 
 os.environ["CONFIGMAP_FILE"] = "config.yml"
-ms = Microservice(service="my-ms", path=__file__)
+ms = Microservice(service="my-minimal-microservice", path=__file__)
 app = ms.create_app()
 
 @app.route("/")