chore(deps): make jf-rescue optional for jf-signature (#842)

* make rescue optional for signature

* changelog

Author: mrain

signature/CHANGELOG.md

@@ -3,6 +3,12 @@
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Untracked
+
+### Changed
+
+- [#842](https://github.com/EspressoSystems/jellyfish/pull/842): `jf-rescue` is now optional for the crate.
+
 ## 0.4.0
 
 ### Breaking Changes

signature/Cargo.toml

@@ -26,7 +26,7 @@ std = [
     "jf-relation/std",
     "zeroize/std",
 ]
-schnorr = []
+schnorr = ["jf-rescue"]
 bls = []
 gadgets = ["schnorr", "jf-relation", "jf-rescue/gadgets"]
 parallel = ["jf-rescue/parallel", "jf-relation/parallel", "jf-utils/parallel"]
@@ -46,7 +46,7 @@ hashbrown = { workspace = true }
 itertools = { workspace = true }
 jf-crhf = { git = "https://github.com/EspressoSystems/jellyfish", tag = "jf-crhf-v0.2.0", default-features = false }
 jf-relation = { git = "https://github.com/EspressoSystems/jellyfish", tag = "jf-relation-v0.5.0", optional = true, default-features = false }
-jf-rescue = { git = "https://github.com/EspressoSystems/jellyfish", tag = "jf-rescue-v0.3.0", default-features = false }
+jf-rescue = { git = "https://github.com/EspressoSystems/jellyfish", tag = "jf-rescue-v0.3.0", optional = true, default-features = false }
 jf-utils = { git = "https://github.com/EspressoSystems/jellyfish", tag = "jf-utils-v0.5.0", default-features = false }
 num-bigint = { workspace = true }
 num-traits = { version = "0.2.15", default-features = false }