[README] Adding informations about keep_value (see #11)
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@ -101,6 +101,7 @@ You can define the following type option :
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* **height**: the height of the captcha image (default=40)
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* **length**: the length of the captcha (number of chars, default 5)
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* **charset**: the charset used for code generation (default=abcdefhjkmnprstuvwxyz23456789)
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* **keep_value**: the value will be the same until the form is posted, even if the page is refreshed (default=true)
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* **as_file**: if set to true an image file will be created instead of embedding to please IE6/7 (default=false)
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* **image_folder**: name of folder for captcha images relative to public web folder in case **as_file** ist set to true (default="captcha")
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* **web_path**: absolute path to public web folder (default="%kernel.root_dir%/../web")
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