Renamed night_vision.json to dark_vision.json

Renamed the file to reflect the power name better

datapack/data/feathermc/origins/bat.json

@@ -6,7 +6,7 @@
     "feathermc:armor_slow",
     "feathermc:dark_sleep",
     "feathermc:blinding_lights",
-    "feathermc:night_vision"
+    "feathermc:dark_vision"
   ],
   "order": 1,
   "impact": 2

datapack/data/feathermc/powers/dark_vision.json

@@ -0,0 +1,11 @@
+{
+  "type": "origins:night_vision",
+  "strength": 0.5,
+  "name": "Darkvision",
+  "description": "You can see in the dark. Somewhat.",
+  "condition": {
+    "type": "origins:brightness",
+    "comparison": "<=",
+    "compare_to": 0.3
+  }
+}