Added in_slot

docs/effects/all-conditions/in_slot.md

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+# `in_slot`
+
+Requires the item (e.g. the EcoItem, enchanted item, reforged item) to be in a certain slot.
+
+This is useful if you want one holder to have different effects depending on the slot it is in.
+
+The options for slot are mainhand, offhand, hands, helmet, chestplate,
+leggings, boots, armor, any, or a number from 0-40 (to specify an exact slot).
+
+# Example Configs
+```yaml
+- id: in_slot
+  args:
+    slot: mainhand # The slot
+```
+
+```yaml
+- id: in_slot
+  args:
+    slots: # You can also provide a list of slots
+      - mainhand
+      - 6
+      - helmet
+```