rewritten includes to lowercase

test/test_edge.cpp

 #include "catch.hpp"
-#include "../graph/Edge.hpp"
+#include "../graph/edge.hpp"
 
 TEST_CASE("Test The Operators '>' and '<'", "[all]") {
     node n1 = node("A");

test/test_node.cpp

 #include "catch.hpp"
-#include "../graph/Edge.hpp"
-#include "../graph/Node.hpp"
+#include "../graph/edge.hpp"
+#include "../graph/node.hpp"
 
 TEST_CASE("Get neighbour nodes should get nodes connected to our node with an edge") {
     node n1 = node("a");