Fix Encoding::CompatibilityError: incompatible encoding regexp match …

[Panczo]

Hi @aegorov,

This is a fix for error Encoding::CompatibilityError: incompatible encoding regexp match (UTF-8 regexp with ASCII-8BIT string).
I encountered it when I wanted to translate text that includes special characters.

translator.translate 'Car', from: 'ru'
=>
Encoding::CompatibilityError: incompatible encoding regexp match (UTF-8 regexp with ASCII-8BIT string) from ../ruby-2.4.0/gems/httparty-0.15.3/lib/httparty/parser.rb:120:ingsub

According to @ericgj from jnunemaker/httparty#75 I've changed default httparty's parser, that fixed this problem.

In order to test request with vcr gem, I've created a new spec file called translator_vcr_spec.rb.
In my test, request requires real api_key, so once you'll get it, create a file spec/secrets.yml, and put it there:
yandex_translator_api_key: your_api_key
This pull request also includes vcr's cassets files, they are inside spec/vcr folder.

[aegorov]

@Panczo Sorry for long pause, thank you for work!