Fix: sleep(Number) is deprecated

Author: ysbaddaden

spec/http_client_pool_spec.cr

@@ -12,7 +12,7 @@ describe DB::Pool do
         requests_per_connection[remote_address] ||= 0
         requests_per_connection[remote_address] += 1
       end
-      sleep context.request.query_params["delay"].to_f
+      sleep context.request.query_params["delay"].to_f.seconds
       context.response.print "ok"
     end
     address = server.bind_unused_port "127.0.0.1"

spec/pool_spec.cr

@@ -13,7 +13,7 @@ class ShouldSleepingOp
     s = self
     @is_sleeping = true
     spawn do
-      sleep 0.1
+      sleep 100.milliseconds
       s.is_sleeping.should be_true
       s.sleep_happened.send(nil)
     end

src/db/pool.cr

@@ -200,7 +200,7 @@ module DB
 
       (current_available + @retry_attempts).times do |i|
         begin
-          sleep @retry_delay if i >= current_available
+          sleep @retry_delay.seconds if i >= current_available
           return yield
         rescue e : PoolResourceLost(T)
           # if the connection is lost it will be closed by