removed deprecated pep8, added pre-commit instead

.pre-commit-config.yaml

+default_stages: [commit, push]
+repos:
+-   repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v2.1.0
+    hooks:
+    -   id: check-added-large-files
+        args: [--maxkb=10000]
+
+    -   id: check-json
+
+    -   id: check-merge-conflict
+
+    -   id: check-yaml
+
+    -   id: end-of-file-fixer
+        types: [python]
+
+    -   id: fix-encoding-pragma
+        args: [--remove]
+
+    -   id: file-contents-sorter
+        files: src/unpacker/passwords|.gitignore|_list.txt
+
+    -   id: flake8
+        args: [--ignore="E501,W503", --select=W504]
+
+    -   id: forbid-new-submodules
+
+    -   id: no-commit-to-branch
+
+    -   id: pretty-format-json
+        args: [--autofix]
+
+    -   id: trailing-whitespace
+        types: [python]
+
+
+-   repo: https://github.com/pre-commit/mirrors-pylint
+    rev: v2.2.2
+    hooks:
+    -   id: pylint
+        language: system
+        args: [--rcfile=.pylintrc]
+
+-   repo: https://github.com/pre-commit/mirrors-jshint
+    rev: v2.10.2
+    hooks:
+    -   id: jshint
+
+-   repo: https://github.com/pre-commit/mirrors-isort
+    rev: v4.3.20
+    hooks:
+    -   id: isort

pytest.ini

 [pytest]
-addopts = --pep8 -v
+addopts = -v
 pep8ignore = 
 	*.py E501

requirements-dev.txt

+pytest
+pytest-cov
+pre-commit

requirements.txt

 requests
-pytest
-pytest-pep8
-pytest-cov
 jinja2
 git+https://github.com/fkie-cad/common_helper_files.git
 git+https://github.com/fkie-cad/common_helper_process.git