Merge pull request #4 from PicturePipe/renovate/docker-shellcheck-1.x

Update shellcheck orb to v1.3.15

Update shellcheck from v0.6.0 to v0.7.0.

Author: keimlink

.circleci/config.yml

@@ -1,7 +1,7 @@
 version: 2.1
 orbs:
   docker-publish: circleci/docker-publish@0.1.7
-  shellcheck: circleci/shellcheck@1.3.14
+  shellcheck: circleci/shellcheck@1.3.15
 
 x-aliases:
   docker-publish-args: &docker-publish-args