Feat/workflows (#49)

* Update auto_assignee.yml

update version from @1.2.7 to @master

* Update automerge.yml

* Update changelog.yml

* Update readme.yml

update version from @1.2.7 to @master

* Update tf-checks.yml

update version from @1.2.7 to @master

* Update tflint.yml

update version from @1.2.7 to @master

* Update tfsec.yml

update version from @1.2.7 to @master