CI: Upgrade to Go 1.13

.github/workflows/test.yml

@@ -5,10 +5,10 @@ jobs:
     name: Linux
     runs-on: ubuntu-latest
     steps:
-      - name: Set up Go 1.12
+      - name: Set up Go 1.13
         uses: actions/setup-go@v1
         with:
-          go-version: 1.12
+          go-version: 1.13
         id: go
 
       - name: Check out code into the Go module directory
@@ -24,10 +24,10 @@ jobs:
     name: Windows
     runs-on: windows-latest
     steps:
-      - name: Set up Go 1.12
+      - name: Set up Go 1.13
         uses: actions/setup-go@v1
         with:
-          go-version: 1.12
+          go-version: 1.13
         id: go
 
       - name: Check out code into the Go module directory
@@ -43,10 +43,10 @@ jobs:
     name: MacOS
     runs-on: macOS-latest
     steps:
-      - name: Set up Go 1.12
+      - name: Set up Go 1.13
         uses: actions/setup-go@v1
         with:
-          go-version: 1.12
+          go-version: 1.13
         id: go
 
       - name: Check out code into the Go module directory

.travis.yml

@@ -1,8 +1,8 @@
 language: go
 
 go:
-  - 1.11.x
   - 1.12.x
+  - 1.13.x
 
 addons:
   apt:

go.mod

@@ -21,3 +21,5 @@ require (
 	gopkg.in/yaml.v2 v2.2.1
 	mvdan.cc/sh v2.6.4+incompatible
 )
+
+go 1.13