Add release notes and bump version for 0.1.3#3759

TheBlueMatt merged 2 commits intolightningdevkit:0.1lightningdevkit/rust-lightning:0.1from

TheBlueMatt:2025-04-0.1.3-relnotesTheBlueMatt/rust-lightning:2025-04-0.1.3-relnotesCopy head branch name to clipboard