codec: travis: spread the work for 386 among 3 go versions

.travis.yml

@@ -16,9 +16,17 @@ script:
   # we use if block below, so that we still return with success even if skipped.
   # Previously, we used [[...]] && go test ..., which returned exit code 0 and broke the build.
   - |
-    if [[ "${TRAVIS_GO_VERSION}" == "1.12.x" ]]; then
+    if [[ "${TRAVIS_GO_VERSION}" == "1.9.x" ]]; then
     GOARCH=386 go test -tags "alltests" -run Suite -coverprofile coverage.386.txt github.com/ugorji/go/codec
     fi
+  - |
+    if [[ "${TRAVIS_GO_VERSION}" == "1.10.x" ]]; then
+    GOARCH=386 go test -tags "alltests safe" -run Suite -coverprofile coverage.386.safe.txt github.com/ugorji/go/codec
+    fi
+  - |
+    if [[ "${TRAVIS_GO_VERSION}" == "1.11.x" ]]; then
+    GOARCH=386 go test -tags "alltests codecgen" -run Suite -coverprofile coverage.386.codecgen.txt github.com/ugorji/go/codec
+    fi
   - |
     if [[ "${TRAVIS_GO_VERSION}" == "1.12.x" ]]; then
     echo "XXXX RACE" && go test "-race" -tags "alltests" -run Suite -coverprofile coverage.race.txt github.com/ugorji/go/codec;