Fixed equals.

Author: atsticks

src/main/java/org/javamoney/moneta/DefaultExchangeRate.java

@@ -266,7 +266,7 @@ public boolean equals(Object obj) {
         }
         if (obj instanceof DefaultExchangeRate) {
             DefaultExchangeRate other = (DefaultExchangeRate) obj;
-            return Objects.equals(base, other.base) && Objects.equals(chain, other.chain) &&
+            return Objects.equals(base, other.base) &&
                     Objects.equals(conversionContext, other.conversionContext) &&
                     Objects.equals(factor, other.factor) && Objects.equals(term, other.term);
         }