update pmtiles dependency to fix issue #193 (#194)

Author: ycouble

package-lock.json

@@ -40,7 +40,7 @@
     "@types/rbush": "^3.0.0",
     "color2k": "^2.0.3",
     "pbf": "^4.0.1",
-    "pmtiles": "^3.0.7",
+    "pmtiles": "^3.1.0",
     "potpack": "^1.0.2",
     "rbush": "^3.0.1"
   },