3523b8e117 Rename generic parameter and variable (yancy)
Pull request description:
Use W for Write
closes https://github.com/rust-bitcoin/rust-bitcoin/issues/3590
ACKs for top commit:
tcharding:
ACK 3523b8e117
apoelstra:
ACK 3523b8e1171663fc93ab25765271a1070a2d649f; successfully ran local tests
Tree-SHA512: 8dd9f38ee07e7652ebd291eb121a2630ebb09ea9ea70873f87e57241f51e5114106517511d1fe07774ec4f42920e9d0619031a1545787631a30422de12421a67