.builds: use Go 1.14 for the basic tests

WebAssembly builds require Go 1.14 since the breaking change in Go,
golang.org/cl/203600.

gofmt -w -s . as well.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

cmd/gogio/e2e_test.go

@@ -47,7 +47,7 @@ func TestEndToEnd(t *testing.T) {
 	t.Parallel()
 
 	// Keep this list local, to not reuse TestDriver objects.
-	subtests := []struct{
+	subtests := []struct {
 		name   string
 		driver TestDriver
 	}{