Replace two old Go versions with two new ones (#478)

Signed-off-by: Juraci Paixão Kröhling <[email protected]>

Author: jpkrohling

.github/workflows/go.yaml

@@ -30,11 +30,11 @@ jobs:
 
   tests:
     runs-on: ${{ matrix.platform }}
-    name: Unit tests on Go ${{ matrix.go }}
+    name: Unit tests on Go ${{ matrix.go }} / ${{ matrix.platform }}
     strategy:
       fail-fast: false
       matrix:
-        go: [ '1.13.x', '1.14.x', '1.15.x' ]
+        go: [ '1.15.x', '1.16.x', '1.17.x' ]
         platform: [ubuntu-latest, macos-latest]
     steps:
       - name: Checkout code into the Go module directory.