PEP 476: Updates based on feedback from python-dev

pep-0476.txt

@@ -87,6 +87,10 @@ that by default. This was decided against for several reasons:
 * Using the platform stores makes it easier to handle situations such as
   corporate internal CAs.
 
+OpenSSL also has a pair of environment variables, ``SSL_CERT_DIR`` and
+``SSL_CERT_FILE`` which can be used to point Python at a different certificate
+database.
+
 Backwards compatibility
 -----------------------
 
@@ -107,6 +111,10 @@ certificates to system trust stores in order to trust them globally.
 Twisted's 14.0 release made this same change, and it has been met with almost
 no opposition.
 
+In order to make this transition as smooth as possible, the next 3.4.x release
+following this PEP will be modified to emit a warning in cases that would raise
+an Exception in Python 3.5.
+
 Other protocols
 ===============