fix Bottle app initialization

Bottle 0.13.0 requires Bottle instances to be initialized with
keyword arguments only. Previously, we were using a positional
argument. This usage was wrong (passing the __name__ string as
a catchall boolean parameter), so it's removed.

apps/bottle_app.py

@@ -4,7 +4,7 @@
 from vulnpy.bottle import add_vulnerable_routes
 
 
-app = Bottle(__name__)
+app = Bottle()
 add_vulnerable_routes(app)