Add fishing flag to documentation (#72)

plotsquared/plot-flags.md

@@ -183,6 +183,7 @@ snowball spectral_arrow shulker_bullet potion trident
 | edit-sign               | Set to `true` to allow players to edit signs in the plot or on the road.                                                | False         |
 | entity-change-block     | Set to `true` to allow entities to change blocks within the plot, if not covered by other flags.                        | False         |
 | explosion               | Set to `true` to allow explosions inside a plot.                                                                        | False         |
+| fishing                 | Set to `true` to allow guests to use a fishing rod in the plot.                                                         | False         |
 | fly                     | Set to `true` to enable flight within the plot.                                                                         | False         |
 | forcefield              | Set to `true` to enable member forcefield in the plot.                                                                  | False         |
 | grass-grow              | Set to `false` to disable grass to grow within the plot.                                                                | True          |