missing method mentioned in javadoc #192

Task-Url: JavaMoney/jsr354-ri#192

Author: keilw

src/main/java/org/javamoney/moneta/convert/ECBHistoricRateProvider.java

@@ -32,7 +32,7 @@
  * The default date is yesterday or the most recent day of week. To uses exchange rate from a specific date, you can use this way:
  * <code>CurrencyUnit termCurrency = ...;</code>
  * <code>LocalDate localDate = ...;</code>
- * <code>ConversionQuery conversionQuery = ConversionQueryBuilder.of().setTermCurrency(euro).setTimestamp(localDate).build();</code>v
+ * <code>ConversionQuery conversionQuery = ConversionQueryBuilder.of().setTermCurrency(euro).set(localDate).build();</code>v
  * <code>CurrencyConversion currencyConversion = provider.getCurrencyConversion(conversionQuery);</code>
  * <code>MonetaryAmount money = ...;</code>
  * <code>MonetaryAmount result = currencyConversion.apply(money);</code>