Fix compilation

Author: sebastiencs

ledger/Cargo.toml

@@ -90,7 +90,7 @@ rand_seeder = "0.2"
 tuple-map = "0.4.0"
 
 [target.'cfg(target_family = "wasm")'.dev-dependencies]
-wasm-bindgen = "0.2.92"
+wasm-bindgen = "=0.2.92"
 wasm-bindgen-test = "0.3"
 web-sys = { version = "0.3", features = ["Blob", "DedicatedWorkerGlobalScope", "MessageEvent", "Url", "Worker", "WorkerType", "WorkerOptions", "console", "Window", "Performance" ] }