Bump Go version in GH actions (close #30)

Author: colmsnowplow

.github/workflows/prerelease.yaml

@@ -13,7 +13,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Validate input
         run: |
@@ -32,7 +32,7 @@ jobs:
       - name: Setup Go
         uses: actions/setup-go@v3
         with:
-          go-version: '1.15'
+          go-version: '>=1.18'
 
       - name: Test
         run: go test ./analytics

.github/workflows/release.yaml

@@ -13,7 +13,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Only run on master
         run: |
@@ -37,9 +37,9 @@ jobs:
           fi
 
       - name: Setup Go
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v3
         with:
-          go-version: '1.15'
+          go-version: '>=1.18'
 
       - name: Test
         run: go test ./analytics

.github/workflows/test.yml

@@ -10,14 +10,18 @@ jobs:
   build:
     runs-on: ubuntu-20.04
 
+    strategy:
+      matrix: 
+        go: ['1.15', '1.16', '1.17', '1.18']
+
     steps:
     - name: Checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
 
     - name: Setup Go
-      uses: actions/setup-go@v2
+      uses: actions/setup-go@v3
       with:
-        go-version: '1.15'
+        go-version: ${{ matrix.go }}
 
     - name: Test
       run: go test ./analytics