Read projection from CRS type EPSG

CRS also may have type 'EPSG' and then the code is reading from property 'code' in object 'properties'

src/ol/format/GeoJSON.js

@@ -162,6 +162,8 @@ class GeoJSON extends JSONFeature {
     if (crs) {
       if (crs['type'] == 'name') {
         projection = getProjection(crs['properties']['name']);
+      } else if (crs['type'] === 'EPSG') {
+        projection = getProjection("EPSG:" + crs['properties']['code']);
       } else {
         assert(false, 36); // Unknown SRS type
       }