Fixed issue with Valgrind.

tests/RandomTests.cpp

@@ -93,7 +93,7 @@ TEST_CASE("Random distribution (max 0, min 2)", "[Utilities]") {
 
 TEST_CASE("Random distribution (max 0, min 3)", "[Utilities]") {
     auto rand = Arbutils::Random(10);
-    const int size = 500000;
+    const size_t size = 100000;
     int arr[size];
     for (size_t i = 0; i < size; i++) {
         arr[i] = rand.Get(0, 3);