bump deps. switch to caret.

Author: ctalkington

package.json

@@ -26,11 +26,11 @@
     "test": "mocha --reporter dot"
   },
   "dependencies": {
-    "buffer-crc32": "~0.2.1",
-    "crc32-stream": "~0.4.0",
-    "node-int64": "~0.4.0",
-    "normalize-path": "~2.0.0",
-    "readable-stream": "~2.0.0"
+    "buffer-crc32": "^0.2.1",
+    "crc32-stream": "^0.4.0",
+    "node-int64": "^0.4.0",
+    "normalize-path": "^2.0.0",
+    "readable-stream": "^2.0.0"
   },
   "devDependencies": {
     "chai": "^3.4.0",