build: Update to go 1.20.

.github/workflows/go.yml

@@ -6,17 +6,17 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go: [1.18, 1.19]
+        go: ["1.19", "1.20"]
     steps:
       - name: Set up Go
-        uses: actions/setup-go@c4a742cab115ed795e34d4513e2cf7d472deb55f #v3.3.1
+        uses: actions/setup-go@6edd4406fa81c3da01a34fa6f6343087c207a568 #v3.5.0
         with:
           go-version: ${{ matrix.go }}
       - name: Check out source
-        uses: actions/checkout@93ea575cb5d8a053eaa0ac8fa3b40d7e05a33cc8 #v3.1.0
+        uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c #v3.3.0
       - name: Build
         run: go build ./...
       - name: Install Linters
-        run: "curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin v1.50.1"
+        run: "curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin v1.51.1"
       - name: Test and Lint
         run: ./run_tests.sh

README.md

@@ -43,7 +43,7 @@ VSP will add the ticket to a pool of always-online voting wallets.
 
 ## Implementation
 
-vspd is built and tested on go 1.18 and 1.19, making use of the following
+vspd is built and tested on go 1.19 and 1.20, making use of the following
 libraries:
 
 - [gin-gonic/gin](https://github.com/gin-gonic/gin) webserver.

go.mod

@@ -1,6 +1,6 @@
 module github.com/decred/vspd
 
-go 1.18
+go 1.19
 
 require (
 	decred.org/dcrwallet/v2 v2.0.9