fix #318: store lastLocation value and fix minTimeInterval and minDis…

…tance filtering

Sources/SwiftLocation/Request/Requests/GPSLocation/GPSLocationRequest.swift

@@ -141,6 +141,8 @@ public class GPSLocationRequest: RequestProtocol, Codable {
         }
 
         if let previousLocation = lastLocation {
+            // We have already received a previous valid location so we'll
+            // also check for distance and interval if required and eventually dispatch value.
             if options.minDistance > kCLDistanceFilterNone,
                previousLocation.distance(from: data) > options.minDistance {
                 return .notMinDistance // minimum distance since last location is not respected.
@@ -152,6 +154,9 @@ public class GPSLocationRequest: RequestProtocol, Codable {
             }
         }
 
+        // Store previous value because it was validated.
+        lastLocation = data
+
         return nil
     }