Reduce namespace length further

src/Collections/Dictionary.hpp

@@ -4,7 +4,7 @@
 #include <unordered_map>
 #include "../Assert.hpp"
 
-namespace ArbUt::Collections {
+namespace ArbUt {
     template <class KeyT, class ValueT> class Dictionary {
     private:
         std::unordered_map<KeyT, ValueT> _map;

src/Collections/List.hpp

@@ -5,7 +5,7 @@
 #include <stdexcept>
 #include <vector>
 
-namespace ArbUt::Collections {
+namespace ArbUt {
     template <class ValueT> class List {
     private:
         std::vector<ValueT> _vector;