Run pylint in pre-commit system hook (#7)

* Run pylint in pre-commit system hook
* Use straight call to pylint for simplicity

`pylint` is available in the environment as long as `akro[dev]` is installed

.pre-commit-config.yaml

@@ -7,6 +7,13 @@ repos:
         language: script
         entry: scripts/check_commit_message
         stages: [commit-msg]
+    -   id: pylint
+        name: pylint
+        entry: pylint
+        args: ['--rcfile=setup.cfg']
+        stages: [commit, push]
+        language: system
+        files: \.py$
 
 -   repo: https://github.com/pre-commit/pre-commit-hooks
     rev: v1.3.0
@@ -62,11 +69,3 @@ repos:
     -   id: yapf
         args: ['-dpr']
         stages: [commit, push]
-
--   repo: https://github.com/pre-commit/mirrors-pylint
-    rev: v2.1.1
-    stages: [commit, push]
-    hooks:
-    -   id: pylint
-        args: ['--rcfile=setup.cfg']
-        stages: [commit, push]