Rename codecov.yml to .codecov.yml

.circleci/config.yml

@@ -57,7 +57,6 @@ jobs:
       - run: TESTARGS="-coverprofile=coverage.txt  -covermode=atomic" make ci
       - codecov/upload:
           file: coverage.txt
-          conf: /go/src/github.com/hashicorp/packer/.codecov.yml
   test-darwin:
     executor: darwin
     working_directory: ~/go/src/github.com/hashicorp/packer
@@ -69,7 +68,6 @@ jobs:
           GOVERSION: "1.13"
       - codecov/upload:
           file: coverage.txt
-          conf: ~/go/src/github.com/hashicorp/packer/.codecov.yml
   test-windows:
     executor:
       name: win/vs2019
@@ -79,7 +77,6 @@ jobs:
           GOVERSION: "1.13"
       - codecov/upload:
           file: coverage.txt
-          conf: ~/go/src/github.com/hashicorp/packer/.codecov.yml
   check-lint:
     executor: golang
     resource_class: large