add setup.cfg to configure flake8

gallery_dl/extractor/deviantart.py

@@ -403,7 +403,8 @@ HEADER_TEMPLATE = """<div usr class="gr">
 
 HEADER_CUSTOM_TEMPLATE = """<div class='boxtop journaltop'>
 <h2>
-    <img src="http://st.deviantart.net/minish/gruzecontrol/icons/journal.gif?2" style="vertical-align:middle" alt=""/>
+    <img src="http://st.deviantart.net/minish/gruzecontrol/icons/journal.gif\
+?2" style="vertical-align:middle" alt=""/>
     <a href="{url}">{title}</a>
 </h2>
 Journal Entry: <span>{date}</span>

setup.cfg

@@ -0,0 +1,3 @@
+[flake8]
+exclude = gallery_dl/__init__.py,gallery_dl/__main__.py,setup.py,build,scripts,archive
+ignore = E203,E226