Now need go version 1.13 to build latest versions of pion/webrtc
CI is failing with the error as are new builds of snowflake that pull the latest version of pion/dtls (v1.5.4 and later)
package crypto/ed25519: unrecognized import path "crypto/ed25519" (import path does not begin with hostname)
We don't have to deal with this at the client side at the moment since versions of go libraries are hard-coded into the build, but we should update .travis.yml to use Go 1.13.