[RFC 1/2] doc: update INSTALL to require GMime 3.0
This is the first step of removing support for pre 3.0 GMime.
This will allow us to spend less developement time ifdefing for
missing features in old GMime. It will also reduce the likelyhood of
bitrot in unused code paths.
INSTALL | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)