fix wasm build (#137)

.github/workflows/rust.yml

@@ -17,8 +17,12 @@ jobs:
       run: rustup component add rustfmt
     - name: Install clippy
       run: rustup component add clippy
+    - name: Install Wasm target
+      run: rustup target add wasm32-unknown-unknown
     - name: Build
       run: cargo build --verbose
+    - name: Wasm build
+      run: cargo build --target wasm32-unknown-unknown
     - name: Build examples
       run: cargo build --examples --verbose
     - name: Run tests

Cargo.toml

@@ -13,11 +13,11 @@ keywords = ["zkSNARKs", "cryptography", "proofs"]
 [dependencies]
 bellperson = { version = "0.24", default-features = false }
 ff = { version = "0.12.0", features = ["derive"] }
-merlin = "3.0.0"
+merlin = {version = "3.0.0", default-features = false }
 digest = "0.8.1"
 sha3 = "0.8.2"
 rayon = "1.3.0"
-rand_core = { version = "0.5", default-features = false }
+rand_core = { version = "0.6.0", default-features = false }
 rand_chacha = "0.3"
 itertools = "0.9.0"
 subtle = "2.4"