Reduce namespace length further

tests/DictionaryTests.cpp

@@ -1,7 +1,7 @@
 #ifdef TESTS_BUILD
 #include "../extern/catch.hpp"
 #include "../src/Collections/Dictionary.hpp"
-using namespace ArbUt::Collections;
+using namespace ArbUt;
 
 TEST_CASE("Create Dictionary, insert values", "[Utilities]") {
     auto dic = Dictionary<int, int>(5);

tests/ListTests.cpp

@@ -1,7 +1,7 @@
 #ifdef TESTS_BUILD
 #include "../extern/catch.hpp"
 #include "../src/Collections/List.hpp"
-using namespace ArbUt::Collections;
+using namespace ArbUt;
 
 TEST_CASE("Create List, insert values", "[Utilities]") {
     auto ls = List<int>();