Fix bad collection

Author: alukach

demo/facebook/facebook_collection.json

@@ -1 +1,12 @@
-{"id":"facebook-population-density","title":"High Resolution Population Density Maps","description":"Population data for a selection of countries, allocated to 1 arcsecond blocks and provided in a combination of CSV and Cloud-optimized GeoTIFF files. This refines CIESIN’s Gridded Population of the World using machine learning models on high-resolution worldwide Digital Globe satellite imagery. CIESIN population counts aggregated from worldwide census data are allocated to blocks where imagery appears to contain buildings.","stac_version":"1.0.0","license":"public-domain","links":[],"extent":{"spatial":{"bbox":[[-180,-90,180,90]]},"temporal":{"interval":[["2016-01-01T00:00:00Z","null"]]}}}
+{
+  "id": "facebook-population-density",
+  "title": "High Resolution Population Density Maps",
+  "description": "Population data for a selection of countries, allocated to 1 arcsecond blocks and provided in a combination of CSV and Cloud-optimized GeoTIFF files. This refines CIESIN’s Gridded Population of the World using machine learning models on high-resolution worldwide Digital Globe satellite imagery. CIESIN population counts aggregated from worldwide census data are allocated to blocks where imagery appears to contain buildings.",
+  "stac_version": "1.0.0",
+  "license": "public-domain",
+  "links": [],
+  "extent": {
+    "spatial": { "bbox": [[-180, -90, 180, 90]] },
+    "temporal": { "interval": [["2016-01-01T00:00:00Z", null]] }
+  }
+}