bip-xchgrate: Provide secondary currency code in response to info req…

…uest

bip-xchgrate.mediawiki

@@ -57,7 +57,8 @@ Parameters:
 Each currency-pair will receive a separate result, a JSON Object, with the following information:
 
 * ''cp'' - The currency-pair token.
-* ''cc'' - The currency code for the primary currency, if any.
+* ''cc'' - The currency code for the primary currency.
+* ''alt'' - The currency code for the secondary currency.
 * ''symbol'' - An Array of prefix and suffix for the primary currency. Each may be either a fixed String, an Array of two Strings (negative and positive), or null. Any positive or negative symbols must be included in this prefix/suffix; it MUST NOT be implied otherwise.
 * ''digits'' - The type of digits to use for the primary currency's numbers. "arabic" should be used for common 0-9 digits.
 * ''grouping'' - An Array alternating between Numbers representing a series of digits, and Strings used as delimiters. If terminated by a zero, the final grouping is to be repeated continually. For example, the common US locale thousands grouping would be <code>[3, ",", 0]</code>