update dependency to Ruby 2.5+

We actually need Ruby 2.3+ for `accept_nonblock(exception: false)';
and (AFAIK) we can't easily use a subclass of `Socket' while using
Socket#accept_nonblock to inject WriteSplat support for
`IO#write(*multi_args)'

So just depend on Ruby 2.5+ since all my Ruby is already on the
already-ancient Ruby 2.7+ anyways.

1 files changed, 1 insertions, 1 deletions

diff --git a/README b/README
index ff14c03..84c0fdf 100644
--- a/README
+++ b/README
@@ -15,7 +15,7 @@ and slow clients.
   cut out everything that is better supported by the operating system,
   {nginx}[https://nginx.org/] or {Rack}[https://rack.github.io/].
 
-* Compatible with Ruby 2.0.0 and later.
+* Compatible with Ruby 2.5 and later.
 
 * Process management: unicorn reaps and restarts workers that die
   from broken code.  There is no need to manage multiple processes