Remove disclaimer

Documentation/INTERNALS.md

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 ---
 
-> :warning: **WARNING** :warning: This project is in a _prerelease_ state. There
-> is active work going on that will result in API changes that can/will break
-> code while things are finished. Use with caution.
-
----
-
 This explanation of the generated code is intended to help people understand
 the design of Swift Protobuf.
 This is not a contract: The details of the generated code are expected to

Documentation/PLUGIN.md

@@ -2,12 +2,6 @@
 
 ---
 
-> :warning: **WARNING** :warning: This project is in a _prerelease_ state. There
-> is active work going on that will result in API changes that can/will break
-> code while things are finished. Use with caution.
-
----
-
 The protoc _plugin_ works with protoc to translate proto files into Swift code.
 
 ## Getting Started