fix: regex to catch inner functions doesn't catch asynchronous ones

docs/release_notes.rst

@@ -14,6 +14,7 @@ New Features
 Bug Fixes
 
 * Update convention support documentation (#386, #393)
+* Detect inner asynchronous functions (#467)
 
 5.0.2 - January 8th, 2020
 ---------------------------

src/pydocstyle/checker.py

@@ -203,7 +203,7 @@ def check_no_blank_before(self, function, docstring):  # def
                 # class.
                 if not (
                     blanks_after_count == 1 and
-                    re(r"\s+(?:(?:class|def)\s|@)").match(after)
+                    re(r"\s+(?:(?:class|def|async def)\s|@)").match(after)
                 ):
                     yield violations.D202(blanks_after_count)
 

src/tests/test_cases/functions.py

@@ -29,6 +29,15 @@ def inner():
     pass
 
 
+def func_with_inner_async_func_after():
+    """Test a function with inner async function after docstring."""
+
+    async def inner():
+        pass
+
+    pass
+
+
 def fake_decorator(decorated):
     """Fake decorator used to test decorated inner func."""
     return decorated
@@ -44,6 +53,16 @@ def inner():
     pass
 
 
+def func_with_inner_decorated_async_func_after():
+    """Test a function with inner decorated async function after docstring."""
+
+    @fake_decorator
+    async def inner():
+        pass
+
+    pass
+
+
 def func_with_inner_class_after():
     """Test a function with inner class after docstring."""