Apparently tools are no longer in beta

Leaving this in actually broke this header:
    anthropic-beta: max-tokens-3-5-sonnet-2024-07-15

I think what's going on is that the server's HTTP implementation doesn't
support duplicate HTTP headers, but the HTTP spec does. It's likely that
they use a String => String mapping for headers, which isn't correct but
is surprisingly common. Unfortunately, the implication is that you can
only enable one beta feature at a time.

src/messages.cr

@@ -31,11 +31,6 @@ module Anthropic
 
       headers = HTTP::Headers.new
 
-      # Tools are apparently in beta as of this writing.
-      if tools.try(&.any?)
-        headers.add "anthropic-beta", "tools-2024-05-16"
-      end
-
       # 3.5 Sonnet only supports 4k tokens by default, but you can opt into
       # up to 8k output tokens.
       # https://x.com/alexalbert__/status/1812921642143900036