bugfix: reset handshake when resetting the connection, as to let the negotiation flow on reconnect

lib/httpx/connection/http1.rb

@@ -44,6 +44,7 @@ module HTTPX
     def reset
       @max_requests = @options.max_requests || MAX_REQUESTS
       @parser.reset!
+      @handshake_completed = false
     end
 
     def close

test/http_test.rb

@@ -58,7 +58,6 @@ class HTTPTest < Minitest::Test
         assert responses.size == 3, "expected 3 responses, got #{responses.size}"
         connection_count = http.pool.connection_count
         assert connection_count == 2, "expected to have 2 connections, instead have #{connection_count}"
-        assert http.connection_exausted, "expected 1 connnection to have exhausted"
       end
     ensure
       server.shutdown