#430 Use the style sub_type for flake8 problems

test/handler/test_flake8_handler.vader

@@ -4,7 +4,7 @@ Before:
 After:
     call ale#linter#Reset()
 
-Execute(The flake8 handler should handle basic errors):
+Execute(The flake8 handler should handle basic warnings):
   AssertEqual
   \ [
   \   {
@@ -12,10 +12,19 @@ Execute(The flake8 handler should handle basic errors):
   \     'col': 6,
   \     'type': 'E',
   \     'text': 'E111: indentation is not a multiple of four',
+  \     'sub_type': 'style',
+  \   },
+  \   {
+  \     'lnum': 7,
+  \     'col': 6,
+  \     'type': 'W',
+  \     'text': 'W123: some warning',
+  \     'sub_type': 'style',
   \   },
   \ ],
   \ ale_linters#python#flake8#Handle(1, [
   \   'stdin:6:6: E111 indentation is not a multiple of four',
+  \   'stdin:7:6: W123 some warning',
   \ ])
 
 Execute(The flake8 handler should set end column indexes should be set for certain errors):
@@ -24,35 +33,35 @@ Execute(The flake8 handler should set end column indexes should be set for certa
   \   {
   \     'lnum': 25,
   \     'col': 1,
-  \     'type': 'W',
+  \     'type': 'E',
   \     'end_col': 3,
   \     'text': 'F821: undefined name ''foo''',
   \   },
   \   {
   \     'lnum': 28,
   \     'col': 5,
-  \     'type': 'W',
+  \     'type': 'E',
   \     'end_col': 9,
   \     'text': 'F405: hello may be undefined, or defined from star imports: x',
   \   },
   \   {
   \     'lnum': 104,
   \     'col': 5,
-  \     'type': 'W',
+  \     'type': 'E',
   \     'end_col': 12,
   \     'text': 'F999: ''continue'' not properly in loop',
   \   },
   \   {
   \     'lnum': 106,
   \     'col': 5,
-  \     'type': 'W',
+  \     'type': 'E',
   \     'end_col': 9,
   \     'text': 'F999: ''break'' outside loop',
   \   },
   \   {
   \     'lnum': 109,
   \     'col': 5,
-  \     'type': 'W',
+  \     'type': 'E',
   \     'end_col': 8,
   \     'text': 'F841: local variable ''test'' is assigned to but never used',
   \   },
@@ -110,6 +119,7 @@ Execute (The flake8 handler should handle names with spaces):
   \     'col': 6,
   \     'type': 'E',
   \     'text': 'E111: indentation is not a multiple of four',
+  \     'sub_type': 'style',
   \   },
   \ ],
   \ ale_linters#python#flake8#Handle(42, [