v0.6.0

What's Changed

• [RTC-18] Don't raise in protect and unprotect by @daniel-jodlos in #14

  The behavior of ExLibSRTP.protect/3, ExLibSRTP.unprotect/3', 'ExLibSRTP.protect_rtcp/3 and ExLibSRTP.unprotect_rtcp/3 has been modified.
  They now indicate errors using {:ok, result} | {:error, reason} scheme, instead of raising.
  All errors are indicated this way, even the ones that indicate a failure in cryptographic mechanisms. It is now a responsibility of a caller to handle these errors as desired.

Full Changelog: v0.5.1...v0.6.0