feat: make apispec dependency optional (#138)

.pylintrc

@@ -305,7 +305,7 @@ max-branches=12
 max-locals=15
 
 # Maximum number of parents for a class (see R0901).
-max-parents=7
+max-parents=15
 
 # Maximum number of public methods for a class (see R0904).
 max-public-methods=20