codec: travis.yml: only include coverage report for the default configuration

codecov.io likes only one file, so that is the only one that we will send.

.travis.yml

@@ -5,10 +5,7 @@ go:
   - 1.9.x
   - tip
 script:
-  - go test -tags "alltests " -run Suite -coverprofile default.cover.txt github.com/ugorji/go/codec
-  - go test -tags "alltests safe" -run Suite -coverprofile safe.cover.txt github.com/ugorji/go/codec
-  - go test -tags "alltests notfastpath" -run Suite -coverprofile notfastpath.cover.txt github.com/ugorji/go/codec
-  - go test -tags "alltests notfastpath safe" -run Suite -coverprofile notfastpath-safe.cover.txt github.com/ugorji/go/codec
+  - go test -tags "alltests" -run Suite -coverprofile default.cover.txt github.com/ugorji/go/codec
 after_success:
   - bash <(curl -s https://codecov.io/bash) -t d363f760-34c1-4232-8c47-569fe7c02549 -f '*.cover.txt'