diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..f10b236
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+venv/
+.tox/
+minecraft_libs/__pycache__/
+version.json
diff --git a/.pylintrc b/.pylintrc
new file mode 100644
index 0000000..0c96ad3
--- /dev/null
+++ b/.pylintrc
@@ -0,0 +1,2 @@
+[BASIC]
+good-names = f
diff --git a/DESC.md b/DESC.md
new file mode 100644
index 0000000..0fb5bc8
--- /dev/null
+++ b/DESC.md
@@ -0,0 +1 @@
+Parse version.json file and return libs
diff --git a/README.md b/README.md
index 164cabe..123b3de 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,2 @@
-* `make_libs_list.py` - parse `version.json` file and return libs
-Moved to [iiiypuk/minecraft-libs-parser](https://github.com/iiiypuk/minecraft-libs-parser).
+## minecraft_libs
+Parse `version.json` file and return libs
diff --git a/dev_requiments.txt b/dev_requiments.txt
new file mode 100644
index 0000000..d13ff40
--- /dev/null
+++ b/dev_requiments.txt
@@ -0,0 +1,4 @@
+black==21.7b0
+click==8.0.1
+flit==3.2.0
+pylint==2.9.5
diff --git a/minecraft_libs/__init__.py b/minecraft_libs/__init__.py
new file mode 100644
index 0000000..48d7f29
--- /dev/null
+++ b/minecraft_libs/__init__.py
@@ -0,0 +1,3 @@
+"""Parse version.json file and return libs"""
+
+__version__ = "1.0.3"
diff --git a/make_libs_list.py b/minecraft_libs/__main__.py
similarity index 69%
rename from make_libs_list.py
rename to minecraft_libs/__main__.py
index 9d1909c..8dd7ae7 100644
--- a/make_libs_list.py
+++ b/minecraft_libs/__main__.py
@@ -1,19 +1,15 @@
-#!/usr/bin/env python3
+"""Parse version.json file and return libs"""
 
 import sys
 import json
 import click
 
-__author__ = "Alexander Popov"
-__version__ = "1.0.2"
-__license__ = "Unlicense"
-
 
 @click.command()
 @click.option("--platform", default=sys.platform, help="Output platform (win32, linux, darwin).")
 @click.option("--output", default="tty", help="Output option (tty, txt).")
 def make_output(platform, output):
-    """ Return libraries list """
+    """Return libraries list"""
 
     libraries = parse_libs()
 
@@ -38,7 +34,7 @@ def make_output(platform, output):
 
         if platform == "win32":
             print("\nWindows generate libraries list complete!")
-        elif platform == "linux" or platform == "darwin":
+        elif ("linux", "darwin") in platform:
             print("\nUnix generate libraries list complete!")
     elif output == "txt":
         with open("./libs.txt", "w", encoding="utf-8") as f:
@@ -46,23 +42,27 @@ def make_output(platform, output):
 
         if platform == "win32":
             print("\nWindows generate libraries list complete!\n" "See libs.txt file.")
-        elif platform == "linux" or platform == "darwin":
+        elif ("linux", "darwin") in platform:
             print("\nUnix generate libraries list complete!\n" "See libs.txt file.")
 
 
 def parse_libs():
-    """ Make libraries list from version.json file """
+    """Make libraries list from version.json file"""
 
     _ = []
 
-    with open("./version.json", "r", encoding="utf-8") as f:
-        file_data = json.loads(f.read())
+    try:
+        with open("./version.json", "r", encoding="utf-8") as f:
+            file_data = json.loads(f.read())
 
-        for lib in file_data["libraries"]:
-            _.append(lib["downloads"]["artifact"]["path"])
+            for lib in file_data["libraries"]:
+                _.append(lib["downloads"]["artifact"]["path"])
+    except FileNotFoundError:
+        print("ERROR: File version.json not found.")
+        sys.exit(-1)
 
     return _
 
 
 if __name__ == "__main__":
-    make_output()
+    make_output(platform=sys.platform, output="tty")
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..098a115
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,25 @@
+[build-system]
+requires = ["flit_core >=2,<4"]
+build-backend = "flit_core.buildapi"
+
+[tool.flit.metadata]
+module = "minecraft_libs"
+author = "Alexander Popov"
+author-email = "iiiypuk@iiiypuk.me"
+requires = [ "click==7.1.2" ]
+description-file = "DESC.md"
+classifiers = [
+	'License :: Public Domain',
+    'Programming Language :: Python :: 3',
+	'Programming Language :: Python :: 3.7',
+	'Programming Language :: Python :: 3.8',
+	'Programming Language :: Python :: 3.9',
+]
+requires-python = ">=3"
+keywords = "iOS,splashscreen,splash-screen"
+
+[tool.flit.metadata.requires-extra]
+dev = ["pylint == 2.7.1", "black == 20.8b1"]
+
+[tool.black]
+line-length = 99
diff --git a/tox.ini b/tox.ini
new file mode 100644
index 0000000..c453187
--- /dev/null
+++ b/tox.ini
@@ -0,0 +1,12 @@
+[tox]
+isolated_build = True
+envlist = py37,py38,py39
+
+[testenv]
+deps =
+    black
+    pylint
+    pytest
+commands =
+    black minecraft_libs
+    pylint minecraft_libs