fix linter errors

.github/dependabot.yml

@@ -1,10 +0,0 @@
-version: 2
-updates:
-  - package-ecosystem: "gomod"
-    directory: "/"
-    schedule:
-      interval: "monthly"
-  - package-ecosystem: "github-actions"
-    directory: "/"
-    schedule:
-        interval: "monthly"

.github/workflows/ci.yaml

@@ -4,22 +4,22 @@ jobs:
   build:
     strategy:
       matrix:
-        version: [1.22.1]
+        version: [1.21]
         os: [ubuntu-latest, windows-latest, macos-latest]
     name: Build
     runs-on: ${{ matrix.os }}
     steps:
-    - name: Set up Go ${{ matrix.version }}
-      uses: actions/setup-go@v5
+    - name: Set up Go
+      uses: actions/setup-go@v3
       with:
-        go-version: '${{ matrix.version }}'
+        go-version: ${{ matrix.version }}
       id: go
 
     - name: checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v3
 
     - name: build
-      run: make
+      run: go build
 
     - name: test
       run: make test
@@ -28,11 +28,9 @@ jobs:
     name: lint
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/setup-go@v5
+      - uses: actions/setup-go@v3
         with:
-          go-version: 1.22
-      - uses: actions/checkout@v4
+          go-version: 1.21
+      - uses: actions/checkout@v3
       - name: golangci-lint
-        uses: golangci/golangci-lint-action@v6
-        with:
-          skip-cache: true
+        uses: golangci/golangci-lint-action@v3

go.mod

@@ -1,15 +1,12 @@
 module rpn
 
-go 1.22
-
-require (
-	github.com/chzyer/readline v1.5.1
-	github.com/rogpeppe/go-internal v1.11.0
-	github.com/spf13/pflag v1.0.5
-	github.com/yuin/gopher-lua v1.1.1
-)
+go 1.20
 
 require (
+	github.com/chzyer/readline v1.5.1 // indirect
+	github.com/rogpeppe/go-internal v1.11.0 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/yuin/gopher-lua v1.1.0 // indirect
 	golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f // indirect
 	golang.org/x/tools v0.1.12 // indirect
 )

go.sum

@@ -8,8 +8,6 @@ github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
 github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/yuin/gopher-lua v1.1.0 h1:BojcDhfyDWgU2f2TOzYK/g5p2gxMrku8oupLDqlnSqE=
 github.com/yuin/gopher-lua v1.1.0/go.mod h1:GBR0iDaNXjAgGg9zfCvksxSRnQx76gclCIb7kdAd1Pw=
-github.com/yuin/gopher-lua v1.1.1 h1:kYKnWBjvbNP4XLT3+bPEwAXJx262OhaHDWDVOPjL46M=
-github.com/yuin/gopher-lua v1.1.1/go.mod h1:GBR0iDaNXjAgGg9zfCvksxSRnQx76gclCIb7kdAd1Pw=
 golang.org/x/sys v0.0.0-20220310020820-b874c991c1a5 h1:y/woIyUBFbpQGKS0u1aHF/40WUDnek3fPOyD08H5Vng=
 golang.org/x/sys v0.0.0-20220310020820-b874c991c1a5/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f h1:v4INt8xihDGvnrfjMDVXGxw9wrfxYyCjk0KbXjhR55s=

main.go

@@ -30,7 +30,7 @@ import (
 	lua "github.com/yuin/gopher-lua"
 )
 
-const VERSION string = "2.1.1"
+const VERSION string = "2.1.0"
 
 const Usage string = `This is rpn, a reverse polish notation calculator cli.