diff --git a/.gitignore b/.gitignore
index 89634ac..6eb93ba 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,3 @@
 venv/
-images/
-logo.png
-
 dist/
 assm/__pycache__
diff --git a/assm/__init__.py b/assm/__init__.py
index 91a2029..ad9d943 100644
--- a/assm/__init__.py
+++ b/assm/__init__.py
@@ -1,3 +1,3 @@
 """iOS splash screen generator"""
 
-__version__ = "0.1.11"
+__version__ = "0.1.1"
diff --git a/assm/__main__.py b/assm/__main__.py
index efca70d..03a212c 100644
--- a/assm/__main__.py
+++ b/assm/__main__.py
@@ -1,11 +1,11 @@
-#!/usr/bin/env python3
+"""iOS splash screen generator"""
 
 import os
-import json
 from PIL import Image
 from assm.devices import APPLE_DEVICES
 
-def makeSplashImage(screen_orientation, screen_width, screen_height, logo_path='logo.png'):
+
+def make_splash_image(screen_orientation, screen_width, screen_height, logo_path):
     """ Generate splash image """
 
     # swap screen sizes
@@ -21,9 +21,12 @@ def makeSplashImage(screen_orientation, screen_width, screen_height, logo_path='
     app_logo = logo_image.resize((logo_size, logo_size))
     splash_image.paste(app_logo, (logo_w_pos, logo_h_pos), app_logo)
 
-    return(splash_image)
+    return splash_image
+
 
 def main(output_folder='./images/'):
+    """Sample main function"""
+
     # check folder exists
     if not os.path.exists(output_folder):
         os.mkdir(output_folder)
@@ -32,31 +35,34 @@ def main(output_folder='./images/'):
     print('Generate portrait splash...')
 
     for device in APPLE_DEVICES:
-        w = APPLE_DEVICES[device][0]
-        h = APPLE_DEVICES[device][1]
+        device_w = APPLE_DEVICES[device][0]
+        device_h = APPLE_DEVICES[device][1]
 
-        file_name = '{folder}/splash-portrait-{height}x{width}.png'.format(
-            folder=output_folder, width=w, height=h)
-        
-        splash = makeSplashImage('portrait', w, h, 'logo.png')
+        file_name = '{f}/splash-portrait-{h}x{w}.png'.format(
+            f=output_folder, w=device_w, h=device_h
+        )
+
+        splash = make_splash_image('portrait', device_w, device_h, 'logo.png')
         splash.save(file_name)
 
-        print('..splash for {w}x{h} saved...'.format(w=w, h=h))
+        print('..splash for {w}x{h} saved...'.format(w=device_w, h=device_h))
 
     # landscape
     print('Generate landscape splash...')
 
     for device in APPLE_DEVICES:
-        w = APPLE_DEVICES[device][0]
-        h = APPLE_DEVICES[device][1]
+        device_w = APPLE_DEVICES[device][0]
+        device_h = APPLE_DEVICES[device][1]
 
-        file_name = '{folder}/splash-landscape-{height}x{width}.png'.format(
-            folder=output_folder, width=w, height=h)
+        file_name = '{f}/splash-landscape-{h}x{w}.png'.format(
+            f=output_folder, w=device_w, h=device_h
+        )
 
-        splash = makeSplashImage('landscape', w, h, 'logo.png')
+        splash = make_splash_image('landscape', device_w, device_h, 'logo.png')
         splash.save(file_name)
 
-        print('...splash for {h}x{w} saved...'.format(w=w, h=h))
+        print('...splash for {h}x{w} saved...'.format(w=device_w, h=device_h))
+
 
 if __name__ == '__main__':
     main()
diff --git a/assm/devices.py b/assm/devices.py
index b698f3d..fa5f598 100644
--- a/assm/devices.py
+++ b/assm/devices.py
@@ -1,3 +1,5 @@
+"""Default iOS screen sizes"""
+
 APPLE_DEVICES = {
     'iPhone SE': [640, 1136],
     'iPhone 6/7/8': [750, 1334],
@@ -8,5 +10,5 @@ APPLE_DEVICES = {
     '9.7" iPad': [1536, 2048],
     '10.5" iPad Pro': [1668, 2224],
     '11" iPad Pro': [1668, 2388],
-    '12.9" iPad Pro': [2048, 2732]
+    '12.9" iPad Pro': [2048, 2732],
 }
diff --git a/dev_requirements.txt b/dev_requirements.txt
new file mode 100644
index 0000000..b67b704
--- /dev/null
+++ b/dev_requirements.txt
@@ -0,0 +1,3 @@
+black==20.8b1
+flit==3.0.0
+pylint==2.7.1
diff --git a/preview.png b/preview.png
deleted file mode 100644
index 880358f..0000000
Binary files a/preview.png and /dev/null differ