Revert "update README on use of encode/decode/transocde in vcl_init()/vcl_fini()"

Actually this bit of the README rightfully only applies to pre 5.0

This reverts commit 371122cd.

README.rst

@@ -404,12 +404,6 @@ string is an illegal format for the decoding scheme.
 If the ``blob`` object constructor fails, then the VCL program will
 fail to load, and the VCC compiler will emit an error message.
 
-For varnish versions before 5.0, the VMOD functions -- ``encode()``,
-``decode()`` and ``transcode()`` -- may not be called in
-``vcl_init()`` or ``vcl_fini()`` (since a workspace must be
-available). Use in ``vcl_init()`` will also cause the VCL program to
-fail with a VCC compiler error.
-
 If any of the VMOD's methods or functions fail at runtime, then an
 error message will be written to the Varnish log using the tag
 ``VCL_Error``. The encoders and decoders return ``NULL`` on failure;