Avoid caret during installation

This restores support for older versions of NPM.

Author: mcollina

package.json

@@ -4,7 +4,7 @@
   "description": "Streams3, a user-land copy of the stream library from Node.js",
   "main": "readable.js",
   "dependencies": {
-    "buffer-shims": "^1.0.0",
+    "buffer-shims": "~1.0.0",
     "core-util-is": "~1.0.0",
     "isarray": "~1.0.0",
     "inherits": "~2.0.1",