Bump required go version to 1.20

.github/workflows/lint.yml

@@ -0,0 +1,19 @@
+name: Lint
+
+on: [pull_request]
+
+jobs:
+  golang:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Set up Golang
+        uses: actions/setup-go@v4
+        with:
+          go-version: '1.20'
+          cache: false
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v3
+        with:
+         version: latest

.github/workflows/tests.yaml

@@ -23,7 +23,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v2
         with:
-          go-version: 1.18
+          go-version: 1.20
 
       - name: Go Build Cache
         uses: actions/cache@v2
@@ -65,7 +65,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v2
         with:
-          go-version: 1.18
+          go-version: 1.20
 
       - name: Go Build Cache
         uses: actions/cache@v2

go.mod

@@ -1,6 +1,6 @@
 module github.com/loopholelabs/frpc-go
 
-go 1.18
+go 1.20
 
 require (
 	github.com/loopholelabs/frisbee-go v0.7.3