Fix typo in image name for lint job

Photonios · Photonios · commit ade23a1e555e · 2019-01-11T13:45:12.000+02:00
diff --git a/.circleci/config.yml b/.circleci/config.yml
@@ -68,7 +68,7 @@ jobs:
 
     lint:
         docker:
-            - image: python3.5-alpine
+            - image: python:3.5-alpine
         steps:
             - checkout
             - run:
