update aiohttp and astroid requirement

pylint 2.3.0 fixes aiohttp failure

.travis.yml

@@ -9,8 +9,6 @@ jobs:
     - stage: code quality
       name: "pylint & mypy"
       install:
-        - pip install astroid==2.0.4
-        # newer astroid and aiohttp fails in pylint so we pre-install older version
         - pip install pylint mypy
         - pip install -e .
       script:

setup.py

@@ -9,7 +9,7 @@ with open(os.path.join(BASE, 'README.md'), encoding='utf-8') as fh:
     long_description = fh.read()
 
 REQUIRES = [
-    'aiohttp==3.4.4', # more recent version of aiohttp break with pylint/astroid
+    'aiohttp==3.5.4',
     'cffi==1.12.1', # TODO: 1.12.2 fails on travis in wine
     'coincurve==11.0.0',
     'pbkdf2==1.3',