A minor release: docs and bugfixing

What's Changed

• Golint by @aspacca in #404
• Update README.md by @modem7 in #414
• Update README.md by @mazedlx in #415
• Edited code of conduct for more information and corrected a grammatical error by @whosoumilarora in #421
• Fix path by @mattn in #416
• fix missed errors by @matsuyoshi30 in #417
• Implement Nix Flake by @ysndr in #424
• issue #420 return 400 response when Max-Days is too big by @kugiyasan in #422
• issue #420 added MaxDate.IsZero() check by @kugiyasan in #427
• Add uploading and copy download command by @GanZhiXiong in #412
• fix in force-https redirect by @aspacca in #441
• remove tor, remove bitcoin, fix contact us by @aspacca in #447

New Contributors

• @modem7 made their first contribution in #414
• @mazedlx made their first contribution in #415
• @whosoumilarora made their first contribution in #421
• @mattn made their first contribution in #416
• @matsuyoshi30 made their first contribution in #417
• @ysndr made their first contribution in #424
• @kugiyasan made their first contribution in #422
• @GanZhiXiong made their first contribution in #412

Full Changelog: v1.3.0...v1.3.1