This patch fixes the encoding issue with the previous releases, also adds the archive source code for version 2.1.5b for ThinkPad P50 laptops

What's Changed

• Fixes garbled characters by @Shuzhengz in https://github.com/Shuzhengz/TPFanCtrl2/pull/41
• 2.1.5b version by @Shuzhengz in https://github.com/Shuzhengz/TPFanCtrl2/pull/39
• 2.1.5a version by @Shuzhengz in https://github.com/Shuzhengz/TPFanCtrl2/pull/40 (closed)
• 2.1.5 Release changes by @Shuzhengz in https://github.com/Shuzhengz/TPFanCtrl2/pull/43

Full Changelog: https://github.com/Shuzhengz/TPFanCtrl2/compare/2.1.4...2.1.5