see #2: code updates

code/9/9.1.noexcept.cpp

@@ -3,6 +3,7 @@
 // modern c++ tutorial
 //
 // created by changkun at changkun.de
+// https://github.com/changkun/modern-cpp-tutorial
 //
 // noexcept
 

code/9/9.2.literals.cpp

@@ -3,6 +3,7 @@
 // modern c++ tutorial
 //
 // created by changkun at changkun.de
+// https://github.com/changkun/modern-cpp-tutorial
 //
 // literals
 

code/9/Makefile

@@ -1,3 +1,10 @@
+#
+# modern cpp tutorial
+#
+# created by changkun at changkun.de
+# https://github.com/changkun/modern-cpp-tutorial
+#
+
 all: $(patsubst %.cpp, %.out, $(wildcard *.cpp))
 
 %.out: %.cpp Makefile