fix: bump workflow setup-go version (#92)

https://github.blog/changelog/2020-10-01-github-actions-deprecating-set-env-and-add-path-commands/

Author: Southclaws

.github/workflows/deploy.yml

@@ -10,7 +10,7 @@ jobs:
     name: deploy
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/setup-go@v2-beta
+      - uses: actions/setup-go@v2
         with:
           go-version: 1.14.1
       - uses: actions/checkout@v2

.github/workflows/stage.yml

@@ -9,7 +9,7 @@ jobs:
     name: stage
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/setup-go@v2-beta
+      - uses: actions/setup-go@v2
         with:
           go-version: 1.14.1
       - uses: actions/checkout@v2

.github/workflows/test.yml

@@ -11,7 +11,7 @@ jobs:
     name: test
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/setup-go@v2-beta
+      - uses: actions/setup-go@v2
         with:
           go-version: 1.14.1
       - uses: actions/checkout@v2