Update Rust crate rand to v0.10.0 #166

Job	Run time
cargo fmt	11s
test python bindings	28s
cargo test (default+wasm)	15s
cargo test (default)	16s
cargo test (default+elgamal3)	19s
test wasm bindings	1m 50s
cargo test (default+python)	13s
cargo test (default+python+elgamal3)	20s
cargo clippy (default)	12s
cargo test (default+legacy)	16s
cargo test (default+wasm+elgamal3)	14s
cargo clippy (default+elgamal3)	18s
cargo clippy (default+legacy)	20s
cargo clippy (default+wasm+elgamal3)	18s
cargo clippy (default+python)	11s
cargo clippy (default+python+elgamal3)	16s
cargo clippy (default+wasm)	18s
	6m 15s

Provide feedback