define node version supported and dep on readable stream.

.travis.yml

@@ -1,3 +1,4 @@
 language: node_js
 node_js:
+  - "0.8"
   - "0.10"

package.json

@@ -4,13 +4,17 @@
   "description": "tar-stream is a streaming tar parser and generator and nothing else. It is streams2 and operates purely using streams which means you can easily extract/parse tarballs without ever hitting the file system.",
   "repository": "git://github.com:mafintosh/tar-stream.git",
   "author": "Mathias Buus <mathiasbuus@gmail.com>",
+  "engines": {
+    "node": ">= 0.8.0"
+  },
   "dependencies": {
     "end-of-stream": "~0.1.3",
     "bl": "~0.6.0"
   },
   "devDependencies": {
     "tap": "~0.4.6",
-    "concat-stream": "~1.2.1"
+    "concat-stream": "~1.2.1",
+    "readable-stream": "~1.1.9"
   },
   "scripts": {
 	"test": "tap test/*.js"