Update change log for negative array indices
## 1.4.0
+* A negative array index may now be used with `MMDB_get_value`,
+ `MMDB_vget_value`, and `MMDB_aget_value`. This specifies the element
+ from the end of the array. For instance, `-1` would refer to the
+ last element of the array. PR by Kyle Box. GitHub #205.
* On Windows, the file name passed to `MMDB_open` is now expected to be
UTF-8 encoded. This allows Unicode characters to be used in file names.
As part of this change, `mmdblookup` on Windows now converts its
