[ANN] rasn1 0.6.2 released

rasn1 0.6.2 has been released.

* home: <https://github.com/sdaubert/rasn1>
* bugs: <https://github.com/sdaubert/rasn1/issues>
* doc: <https://github.com/sdaubert/rasn1/wiki>

RASN1 is a pure ruby ASN.1 library. RASN1 helps to create ASN.1 parsers
and encoders.

Changes:

### 0.6.2 / 2018-05-28

* Add Types::UtcTime and Types::GeneralizedTime