Added flake8 config.

Author: aparajita

.sublimelinterrc

@@ -1,5 +1,9 @@
 {
+    "@python": 3,
     "linters": {
+        "flake8": {
+            "max-line-length": 120
+        },
         "pep8": {
             "max-line-length": 120
         }