Fix deprecated LogHandler.new(IO)

spec/std/http/server/handlers/log_handler_spec.cr

@@ -37,6 +37,20 @@ describe HTTP::LogHandler do
     )
   end
 
+  it "logs to io" do
+    request = HTTP::Request.new("GET", "/")
+    response = HTTP::Server::Response.new(IO::Memory.new)
+    context = HTTP::Server::Context.new(request, response)
+
+    backend = Log::MemoryBackend.new
+    io = IO::Memory.new
+    handler = HTTP::LogHandler.new(io)
+    handler.next = ->(ctx : HTTP::Server::Context) {}
+    handler.call(context)
+
+    io.to_s.should match(%r(- - GET / HTTP/1.1 - 200 \(\d+(\.\d+)?[mµn]s\)$))
+  end
+
   it "log failed request" do
     io = IO::Memory.new
     request = HTTP::Request.new("GET", "/")

src/http/server/handlers/log_handler.cr

@@ -7,7 +7,7 @@ class HTTP::LogHandler
 
   @[Deprecated("Use `new([Log])` instead")]
   def initialize(io : IO)
-    @log = Log.for("http.server")
+    @log = Log.new("http.server", Log::IOBackend.new(io), :info)
   end
 
   def initialize(@log = Log.for("http.server"))