Migrate "style" task

tasks.py

@@ -145,6 +145,15 @@ def update(c):
     """
     pass
 
+@task
+def style(c):
+    """
+    Run PEP style checks against InvenTree sourcecode
+    """
+
+    print("Running PEP style checks...")
+    c.run('flake8 InvenTree')
+
 @task
 def test(c):
     """