Start specifying dnscrypt-proxy.exe version

Currently, when using the Sigcheck by Sysinternals application, I cannot understand whether the application I am using requires an update, or is its version the same as the latest in the repository?

```
...
Algorithm: sha256RSA
Valid from: 3:00 02.04.2008
Valid to: 2:59 02.12.2037
Company: n/a
Description: n/a
Product: n/a
Prod version: n/a
File version: n/a
MachineType: 64-bit
Binary Version: n/a
Original Name: n/a
Internal Name: n/a
Copyright: n/a
Comments: n/a
Entropy: 5.961
...
```