Fixed ugly typo regarding qt-not-found in OpenFLipper-CMakeLists.txt. Better...

Fixed ugly typo regarding qt-not-found in OpenFLipper-CMakeLists.txt. Better explanation for what went wrong.

cmake/CMakeLists.txt

@@ -76,7 +76,7 @@ include(ACGQt)
 acg_qt5 ()
 
 if (NOT QT5_FOUND)
-  message(FATAL_ERROR "Could not found any QT Version. Please specify QT5_INSTALL_PATH (path to bin and include dir) to build with QT5")
+  message(FATAL_ERROR "Could not find any QT Version. Please specify QT5_INSTALL_PATH (path to bin and include dir) to build with QT5. Note that this error is also shown if not all required qt modules were found, e.g. Qt5Script.")
 endif()
 
 # display warnings if a problematic qt version is used