Stop pinning pylint/astroid to 1.3.1/1.2.1.

.pylintrc

@@ -2,6 +2,7 @@
 
 [MASTER]
 ignore=ez_setup.py
+extension-pkg-whitelist=PyQt5,sip
 
 [MESSAGES CONTROL]
 disable=no-self-use,
@@ -23,7 +24,8 @@ disable=no-self-use,
         too-many-instance-attributes,
         unnecessary-lambda,
         blacklisted-name,
-        too-many-lines
+        too-many-lines,
+        logging-format-interpolation
 
 [BASIC]
 module-rgx=(__)?[a-z][a-z0-9_]*(__)?$

scripts/init_venv.py

@@ -70,8 +70,8 @@ def get_dev_packages(short=False):
     Args:
         short: Remove the version specification.
     """
-    packages = ['colorlog', 'flake8', 'astroid==1.2.1', 'pylint==1.3.1',
-                'pep257', 'colorama', 'beautifulsoup4']
+    packages = ['colorlog', 'flake8', 'astroid', 'pylint', 'pep257',
+                'colorama', 'beautifulsoup4']
     if short:
         packages = [re.split(r'[<>=]', p)[0] for p in packages]
     return packages