Static methods missing a type definition are highlighted incorrectly

Step 1: Are you in the right place?

• I have verified there are no duplicate active or recent bugs, questions, or requests
• I have verified that I am using the latest version of the plugin.

Step 2: Describe your environment

• Plugin version: 0.10.2
• PyCharm/IDEA version: PyCharm 2018.2
• Mypy version: 0.620

Step 3: Describe the problem:

Steps to reproduce:

1. Write a method annotated with @staticmethod.
2. Run the mypy checker.

Observed Results:

The highlight exposing a missing type definition starts immediately after the staticmethod annotation and ends right before def.

Expected Results:

def should be highlighted.

Relevant Code:

    @staticmethod
    def email_sent_on(obj):
        return obj.created_on