Add overpass-layer (first sketches)

package.json

@@ -74,6 +74,7 @@
         "leaflet.stravasegments": "2.3.2",
         "mapbbcode": "MapBBCode/mapbbcode#v1.2.0",
         "osmtogeojson": "^3.0.0-beta.4",
+        "overpass-layer": "^3.0.0",
         "regenerator-runtime": "^0.13.7",
         "togpx": "^0.5.4",
         "topojson-client": "^3.1.0",
@@ -277,6 +278,11 @@
             "main": [
                 "minified.js"
             ]
+        },
+        "overpass-layer": {
+            "main": [
+                "dist/overpass-layer.js"
+            ]
         }
     }
 }