Depend on git dependency for secp256kfun

until rust-lang/cargo#8832 is stabalized and I
can stop it pulling in unecessary dependencies.

Author: LLFourn

Cargo.lock

@@ -6,8 +6,8 @@ edition = "2018"
 
 [dependencies]
 olivia_core = { path = "../olivia_core" }
-schnorr_fun = { version = "0.6", features = ["serde" ] }
-ecdsa_fun = { version = "0.6", default-features = false, features = ["serde"] }
+schnorr_fun = { git = "https://github.com/LLFourn/secp256kfun.git", rev = "2a361f26c82552099bfecffe5955cda83c226a9b", features = ["serde" ] }
+ecdsa_fun = { git = "https://github.com/LLFourn/secp256kfun.git", rev =  "2a361f26c82552099bfecffe5955cda83c226a9b", default-features = false, features = ["serde"] }
 serde  = { version = "1", default-features = false }
 lazy_static = "1"
 sha2 = "0.9"