Puma: v5.0.0.beta2 Release

This is the final beta release before 5.0.0.

Differences versus 5.0.0.beta1 are these additional bugfixes:

• Fixed a typo re: maximum URI path length #2344
• rack.multithread and rack.multiprocess now dynamically resolved by max_thread and workers respectively (#2288)
• Log binding on http:// for TCP bindings to make it clickable
• Fix JSON loading issues on phased-restarts (#2269)
• Improve shutdown reliability (#2312, #2338)
• Close client http connections made to an ssl server with TLSv1.3 (#2116)
• Fix for spawning subprocesses with fork_worker option (#2267)
• Set CONTENT_LENGTH for chunked requests (#2287)
• JRuby - Add Puma::MiniSSL::Engine#init? and #teardown methods, run all SSL tests (#2317)
• Improve shutdown reliability (#2312)
• Resolve issue with threadpool waiting counter decrement when thread is killed
• Constrain rake-compiler version to 0.9.4 to fix ClassNotFound exception when using MiniSSL with Java8.
• Fix recursive prune_bundler (#2319).
• Ensure that TCP_CORK is usable
• Fix corner case when request body is chunked (#2326)