Update app.py

Author: alesanchezr

src/app.py

@@ -14,7 +14,7 @@
 
 #from models import Person
 
-ENV = os.getenv("FLASK_ENV")
+ENV = "development" if os.getenv("FLASK_DEBUG") == "1" else "production"
 static_file_dir = os.path.join(os.path.dirname(os.path.realpath(__file__)), '../public/')
 app = Flask(__name__)
 app.url_map.strict_slashes = False