Fix naming in FixedPointCoordinate

include/engine/plugins/nearest.hpp

@@ -27,7 +27,7 @@ template <class DataFacadeT> class NearestPlugin final : public BasePlugin
     {
         // check number of parameters
         if (route_parameters.coordinates.empty() ||
-            !route_parameters.coordinates.front().is_valid())
+            !route_parameters.coordinates.front().IsValid())
         {
             return Status::Error;
         }

include/engine/plugins/plugin_base.hpp

@@ -33,7 +33,7 @@ class BasePlugin
         if (min > coordinates.size() || std::any_of(std::begin(coordinates), std::end(coordinates),
                                                     [](const FixedPointCoordinate &coordinate)
                                                     {
-                                                        return !coordinate.is_valid();
+                                                        return !coordinate.IsValid();
                                                     }))
         {
             return false;