make transact method private

spec/agent_spec.cr

@@ -57,17 +57,7 @@ describe "Mechanize Agent test" do
     agent2.history.pop.uri.to_s.should eq "http://example.com/form"
   end
 
-  it "doesn't add page to history within transact block" do
+  it "can download page, and it isn't recorded in history." do
-    agent = Mechanize.new
-    agent.get("http://example.com/")
-    agent.history.size.should eq 1
-    agent.transact do
-      agent.get("http://example.com/")
-    end
-    agent.history.size.should eq 1
-  end
-
-  it "can download page" do
     agent = Mechanize.new
     agent.history.size.should eq 0
     agent.download("http://example.com", "mechanizecr_example.html")

src/mechanize.cr

@@ -221,7 +221,7 @@ class Mechanize
   end
 
   # Runs given block, then resets the page history as it was before.
-  def transact
+  private def transact
     # save the previous history status.
     history_backup = MechanizeCr::History.new(@agent.history.max_size, @agent.history.array.dup)
     begin