Update note on durable storage

Author: puredanger

README.md

@@ -8,7 +8,7 @@ Transit is a data format and a set of libraries for conveying values between app
 
 This implementation's major.minor version number corresponds to the version of the Transit specification it supports.
 
-_NOTE: Transit is a work in progress and may evolve based on feedback. As a result, while Transit is a great option for transferring data between applications, it should not yet be used for storing data durably over time. This recommendation will change when the specification is complete._
+_NOTE: Transit is intended primarily as a wire protocol for transferring data between applications. If storing Transit data durably, readers and writers are expected to use the same version of Transit and you are responsible for migrating/transforming/re-storing that data when and if the transit format changes._
 
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