Remove unused includes

src/HistorianHysteria.cpp

@@ -13,8 +13,6 @@
 // You should have received a copy of the GNU General Public License along with
 // this program.  If not, see <http://www.gnu.org/licenses/>.
 
-#include <iostream>
-
 #include <aoc/HistorianHysteria.hpp>
 
 const std::string HistorianHysteria::getPuzzleName() const

src/RedNosedReports.cpp

@@ -15,7 +15,6 @@
 
 #include <aoc/RedNosedReports.hpp>
 
-#include <iostream>
 #include <sstream>
 #include <vector>
 

src/ResonantCollinearity.cpp

@@ -15,8 +15,6 @@
 
 #include <aoc/ResonantCollinearity.hpp>
 
-#include <iostream>
-
 const std::string ResonantCollinearity::getPuzzleName() const
 {
     return "Day 8: Resonant Collinearity";