Bump minimum Go version to 1.18

.github/workflows/go.yml

@@ -10,10 +10,10 @@ jobs:
         os: [macOS-latest, windows-latest, ubuntu-latest]
 
     steps:
-    - name: Set up Go 1.13
+    - name: Set up Go 1.18
       uses: actions/setup-go@v5
       with:
-        go-version: 1.13
+        go-version: 1.18
       id: go
 
     - name: Check out code into the Go module directory

go.mod

@@ -1,5 +1,11 @@
 module github.com/deluan/lookup
 
-go 1.13
+go 1.18
 
 require github.com/smartystreets/goconvey v1.8.1
+
+require (
+	github.com/gopherjs/gopherjs v1.17.2 // indirect
+	github.com/jtolds/gls v4.20.0+incompatible // indirect
+	github.com/smarty/assertions v1.15.0 // indirect
+)