added additional file

git-svn-id: https://pythonqt.svn.sourceforge.net/svnroot/pythonqt/trunk@221 ea8d5007-eb21-0410-b261-ccb3ea6e24a9

Author: florianlink

CMakeLists.txt

@@ -129,6 +129,7 @@ set(headers
     src/PythonQtQFileImporter.h
     src/PythonQtSignalReceiver.h
     src/PythonQtSlot.h
+    src/PythonQtSignal.h
     src/PythonQtStdDecorators.h
     src/PythonQtStdIn.h
     src/PythonQtStdOut.h