Moxie Marlinspike 8aa185070b Update libsignalservice to 2.13.0
- Eliminate the explicit spongycastle dependency. All access to
  primitives is done through the JCE interfaces now, which allows
  us to use a secure native-backed provider like conscrypt.

- Use conscrypt for our default security provider. This gives us
  fast TLS 1.2 and 1.3 support on all devices, even before they
  had platform support (like 4.4).

- Update minSdk to 18. Unfortunately the JCE interfaces for GCM
  primitives are JDK 7+ (!) only, which became supported by Android
  at 18.
2019-03-21 11:19:06 -07:00
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