Remove outdated skip & version mention

Author: hynek

docs/types.md

@@ -1,6 +1,6 @@
 # Type Annotations
 
-*attrs* comes with first class support for type annotations for both Python 3.6 ({pep}`526`) and legacy syntax.
+*attrs* comes with first-class support for type annotations for both {pep}`526` and legacy syntax.
 
 However they will forever remain *optional*, therefore the example from the README could also be written as:
 

tests/test_pyright.py

@@ -4,17 +4,13 @@
 import os.path
 import shutil
 import subprocess
-import sys
 
 import pytest
 
 import attrs
 
 
 pytestmark = [
-    pytest.mark.skipif(
-        sys.version_info < (3, 7), reason="Requires Python 3.7+."
-    ),
     pytest.mark.skipif(
         shutil.which("pyright") is None, reason="Requires pyright."
     ),