Updated C++ requirement on MacOS workflow pipeline.

Author: nthnn

.github/workflows/macos_ci.yml

@@ -19,8 +19,8 @@ jobs:
       - name: Build Example
         run: |
           mkdir dist
-          g++ -std=c++11 -o dist/basic_example -Iinclude src/myshell.cpp examples/basic_example.cpp
-          g++ -std=c++11 -o dist/interactive_example -Iinclude src/myshell.cpp examples/interactive_example.cpp
+          g++ -std=c++14 -o dist/basic_example -Iinclude src/myshell.cpp examples/basic_example.cpp
+          g++ -std=c++14 -o dist/interactive_example -Iinclude src/myshell.cpp examples/interactive_example.cpp
 
       - name: Test Build Output Binaries
         run: |