Add old currency RUR

[BuTeK]

Could you add the old currency of the Russian Federation RUR (code:810, minorUtit: 2).
Some of the services return 'RUR', which causes NPE in our code

[TakahikoKawasaki]

@BuTeK Released nv-i18n version 1.20 to include RUR.

[BuTeK]

You have helped us very much! Thank you!!!!

[TakahikoKawasaki]

You are welcome.