docs: Update version compatibility table for v1.14.6

Document that version 1.14.6 fixed the Spigot 1.20 workaround's
exception handling that was interfering with CraftBukkit 1.21.5.

The loosened exception handling in the SPIGOT-7391 workaround now
properly catches `ReflectiveOperationException` instead of just
`NoSuchFieldException`, preventing exceptions from propagating to the
reflection fallback code path.

Author: Deltik

README.md

@@ -521,7 +521,8 @@ by using stable API methods where possible and failing gracefully when a feature
 | `>= 1.12.7, < 1.13.4`         | 1.13                      | 1.17.1                     | Plugin updated to tolerate [a CraftBukkit unstable API (`net.minecraft` code) obfuscation requirement for Minecraft 1.17](https://web.archive.org/web/20210613005238/https://www.spigotmc.org/threads/spigot-bungeecord-1-17.510208/#post-4184317) |
 | `= 1.13.5`                    | 1.13                      | 1.19.4                     | Plugin updated again to tolerate even more obfuscation of the CraftBukkit unstable API; no more dependency on CraftBukkit if running on Bukkit 1.18 or newer                                                                                       |
 | `>= 1.13.6, < 1.14`           | 1.8.3                     | 1.19.4                     | Better error handling lets the plugin run with a limited feature set on old versions of Bukkit                                                                                                                                                     |
-| `>= 1.14`                     | 1.8.3                     | _No known incompatibility_ | Support for Minecraft 1.20 sign sides (front and back), hanging signs, and waxed signs                                                                                                                                                             |
+| `>= 1.14, < 1.14.6`           | 1.8.3                     | 1.21.4                     | Support for Minecraft 1.20 sign sides (front and back), hanging signs, and waxed signs                                                                                                                                                             |
+| `>= 1.14.6`                   | 1.8.3                     | _No known incompatibility_ | Loosened the [SPIGOT-7391 workaround](https://github.com/Deltik/SignEdit/commit/2a8b34ee) [exception handling](https://github.com/Deltik/SignEdit/commit/d7777e3c) that interfered with API changes in CraftBukkit 1.21.5                          |
 
 ### Backwards Compatibility with Omel's SignEdit v1.3