Add flush on newline Fixes #15

spec/logger_spec.cr

@@ -18,8 +18,7 @@ describe "Logger" do
     logger = Kemal::Logger.new
     logger.handler.should be_a File
   end
-
+  
-  #TODO: Check https://github.com/manastech/crystal/issues/1899
   it "writes to a file in production" do
     config = Kemal.config
     config.env = "production"
@@ -28,6 +27,6 @@ describe "Logger" do
     logger.call request
     str = File.read("kemal.log")
     File.delete("kemal.log")
-    str.includes?("GET /?message=world&time=now").should eq false
+    str.includes?("GET /?message=world&time=now").should eq true
   end
 end

src/kemal/logger.cr

@@ -4,7 +4,9 @@ class Kemal::Logger < HTTP::Handler
   def initialize
     @env = Kemal.config.env
     @handler = if @env == "production"
-                 File.new("kemal.log", "a")
+                 handler = File.new("kemal.log", "a")
+                 handler.flush_on_newline = true
+                 handler
                else
                  STDOUT
                end