message: corrects changelog
diff: # Changelog
  -## 1.8.0 - 2018-1-31
  +## 1.8.0 - 2018-01-31
  * Added function `indy_get_current_error` to get additional information for last error occurred in Libindy.
  * Updated Libindy wrappers for automatic getting error details:
  * Python - added `message` and `indy_backtrace` fields to `IndyError` object.
  