readme: Add a link to our newly created mailing list

Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>
mingw32-openssl: Upgrade to version 1.0.1g to fix the Heartbeat overflow issue

Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>
msys-openssl: Upgrade to version 1.0.1g to fix the Heartbeat overflow issue

Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>
mingw32-winpty: Start the package revision at 1 instead of 0

This is to align with other packages.

Signed-off-by: Sebastian Schuberth <sschuberth@gmail.com>