feat: make mcpp::fillHeight const

Author: dxrcy

include/mcpp/mcpp.h

@@ -160,7 +160,7 @@ class MinecraftConnection {
    * @param loc 2D coordinate
    * @return Returns the coordinate with the filled-in height.
    */
-  Coordinate fillHeight(Coordinate2D loc);
+  Coordinate fillHeight(Coordinate2D loc) const;
 
   /**
    * @brief Provides a scaled option of the getHeight call to allow for

src/mcpp.cpp

@@ -108,7 +108,7 @@ int MinecraftConnection::getHeight(Coordinate2D loc) const {
   return stoi(response);
 }
 
-Coordinate MinecraftConnection::fillHeight(Coordinate2D loc) {
+Coordinate MinecraftConnection::fillHeight(Coordinate2D loc) const {
   int y = this->getHeight(loc);
   return Coordinate(loc.x, y, loc.z);
 }