Add make target for updating secrets

Author: adamtheturtle

CONTRIBUTING.md

@@ -125,11 +125,7 @@ gem install travis --no-rdoc --no-ri
 Add the encrypted secrets files to the repository and Travis CI:
 
 ```sh
-tar cvf secrets.tar ci_secrets/
-travis encrypt-file secrets.tar --add --force
-git add secrets.tar.enc .travis.yml
-git commit -m 'Update secret archive'
-git push
+make update-secrets
 ```
 
 Note that the [Travis CI documentation](https://docs.travis-ci.com/user/encrypting-files/#Caveat) warns that this might not work on Windows.

Makefile

@@ -15,7 +15,16 @@ lint:
 	vulture . --min-confidence 100
 	yapf --diff --recursive src/ tests/ ci/
 
+.PHONY: fix-lint
 fix-lint:
 	autoflake --in-place --recursive --remove-all-unused-imports --remove-unused-variables .
 	yapf --in-place --recursive .
 	isort --recursive --apply
+
+.PHONY: update-secrets
+update-secrets:
+	tar cvf secrets.tar ci_secrets/
+	travis encrypt-file secrets.tar --add --force
+	git add secrets.tar.enc .travis.yml
+	git commit -m 'Update secret archive [skip ci]'
+	git push