Support Python 3.9 and 3.10 and update dependencies

Author: Cito

.travis.yml

@@ -3,7 +3,10 @@ matrix:
   include:
     - name: Code quality tests
       env: TOXENV=black,flake8,mypy,docs,manifest
-      python: 3.7
+      python: 3.8
+    - name: Unit tests with Python 3.9
+      env: TOXENV=py38
+      python: 3.9
     - name: Unit tests with Python 3.8
       env: TOXENV=py38
       python: 3.8

docs/conf.py

@@ -51,7 +51,7 @@
 
 # General information about the project.
 project = 'GraphQL-core 3'
-copyright = '2020, Christoph Zwerschke'
+copyright = '2021, Christoph Zwerschke'
 author = 'Christoph Zwerschke'
 
 # The version info for the project you're documenting, acts as replacement for

docs/modules/error.rst

@@ -7,6 +7,7 @@ Error
 
 .. autoexception:: GraphQLError
    :members:
+   :no-inherited-members:
 
 .. autoexception:: GraphQLSyntaxError
 

docs/usage/queries.rst

@@ -28,7 +28,7 @@ Here is one way to use it::
         """)
         print(result)
 
-    asyncio.get_event_loop().run_until_complete(query_artoo())
+    asyncio.run(query_artoo())
 
 In our query, we asked for the droid with the id 2001, which is R2-D2, and its primary
 function, Astromech. When everything has been implemented correctly as shown above, you