Correct ~ escape ordering test. Fixes #3.

Author: mnot

spec_tests.json

@@ -193,10 +193,10 @@
        "/": 9,
        "~1": 10 
     },
-    "patch": [{"op": "test", "path": "/~01", "value":"foo"}],
+    "patch": [{"op": "test", "path": "/~01", "value":"10"}],
     "expected": {
        "/": 9,
-       "~1": "foo"       
+       "~1": 10 
     }
   }