Update code example to Python 3
Update code example to Python 3

Now that it is past January 1, 2020, the code example in the README should be in Python 3
tensorflow/tensorflow-experimental_link_static_libraries_once,Intel-Corporation/tensorflow,petewarden/tensorflow,tensorflow/tensorflow,Intel-tensorflow/tensorflow,Intel-tensorflow/tensorflow,gunan/tensorflow,petewarden/tensorflow,renyi533/tensorflow,aam-at/tensorflow,gunan/tensorflow,paolodedios/tensorflow,aam-at/tensorflow,davidzchen/tensorflow,gunan/tensorflow,davidzchen/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,davidzchen/tensorflow,freedomtan/tensorflow,gautam1858/tensorflow,aldian/tensorflow,gunan/tensorflow,karllessard/tensorflow,Intel-tensorflow/tensorflow,Intel-Corporation/tensorflow,freedomtan/tensorflow,yongtang/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,paolodedios/tensorflow,frreiss/tensorflow-fred,xzturn/tensorflow,frreiss/tensorflow-fred,gunan/tensorflow,tensorflow/tensorflow,frreiss/tensorflow-fred,cxxgtxy/tensorflow,tensorflow/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,aam-at/tensorflow,sarvex/tensorflow,karllessard/tensorflow,davidzchen/tensorflow,aldian/tensorflow,davidzchen/tensorflow,paolodedios/tensorflow,tensorflow/tensorflow,annarev/tensorflow,petewarden/tensorflow,frreiss/tensorflow-fred,freedomtan/tensorflow,karllessard/tensorflow,paolodedios/tensorflow,Intel-Corporation/tensorflow,annarev/tensorflow,cxxgtxy/tensorflow,aam-at/tensorflow,aam-at/tensorflow,sarvex/tensorflow,annarev/tensorflow,karllessard/tensorflow,tensorflow/tensorflow-pywrap_saved_model,aldian/tensorflow,gautam1858/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow-pywrap_saved_model,frreiss/tensorflow-fred,freedomtan/tensorflow,annarev/tensorflow,tensorflow/tensorflow,freedomtan/tensorflow,karllessard/tensorflow,gunan/tensorflow,xzturn/tensorflow,gautam1858/tensorflow,davidzchen/tensorflow,renyi533/tensorflow,xzturn/tensorflow,xzturn/tensorflow,cxxgtxy/tensorflow,paolodedios/tensorflow,yongtang/tensorflow,petewarden/tensorflow,xzturn/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,gautam1858/tensorflow,davidzchen/tensorflow,aldian/tensorflow,annarev/tensorflow,petewarden/tensorflow,xzturn/tensorflow,tensorflow/tensorflow-pywrap_saved_model,freedomtan/tensorflow,cxxgtxy/tensorflow,xzturn/tensorflow,Intel-Corporation/tensorflow,Intel-tensorflow/tensorflow,aam-at/tensorflow,annarev/tensorflow,davidzchen/tensorflow,annarev/tensorflow,annarev/tensorflow,tensorflow/tensorflow-pywrap_saved_model,sarvex/tensorflow,davidzchen/tensorflow,yongtang/tensorflow,frreiss/tensorflow-fred,sarvex/tensorflow,aldian/tensorflow,petewarden/tensorflow,gunan/tensorflow,xzturn/tensorflow,Intel-Corporation/tensorflow,gautam1858/tensorflow,gautam1858/tensorflow,aam-at/tensorflow,gunan/tensorflow,frreiss/tensorflow-fred,tensorflow/tensorflow-pywrap_tf_optimizer,cxxgtxy/tensorflow,sarvex/tensorflow,Intel-tensorflow/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,freedomtan/tensorflow,aam-at/tensorflow,frreiss/tensorflow-fred,yongtang/tensorflow,yongtang/tensorflow,frreiss/tensorflow-fred,Intel-tensorflow/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,tensorflow/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow-pywrap_saved_model,frreiss/tensorflow-fred,renyi533/tensorflow,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow,renyi533/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,yongtang/tensorflow,tensorflow/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,tensorflow/tensorflow-pywrap_tf_optimizer,petewarden/tensorflow,petewarden/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,davidzchen/tensorflow,gunan/tensorflow,frreiss/tensorflow-fred,tensorflow/tensorflow-experimental_link_static_libraries_once,Intel-tensorflow/tensorflow,Intel-Corporation/tensorflow,paolodedios/tensorflow,gautam1858/tensorflow,paolodedios/tensorflow,aldian/tensorflow,renyi533/tensorflow,annarev/tensorflow,Intel-Corporation/tensorflow,sarvex/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,tensorflow/tensorflow-pywrap_tf_optimizer,paolodedios/tensorflow,Intel-tensorflow/tensorflow,renyi533/tensorflow,freedomtan/tensorflow,yongtang/tensorflow,petewarden/tensorflow,yongtang/tensorflow,freedomtan/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,davidzchen/tensorflow,renyi533/tensorflow,frreiss/tensorflow-fred,renyi533/tensorflow,karllessard/tensorflow,xzturn/tensorflow,Intel-tensorflow/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,gautam1858/tensorflow,cxxgtxy/tensorflow,renyi533/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,tensorflow/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,cxxgtxy/tensorflow,renyi533/tensorflow,gunan/tensorflow,tensorflow/tensorflow-pywrap_saved_model,cxxgtxy/tensorflow,sarvex/tensorflow,Intel-tensorflow/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,renyi533/tensorflow,Intel-tensorflow/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,yongtang/tensorflow,karllessard/tensorflow,tensorflow/tensorflow-pywrap_saved_model,petewarden/tensorflow,renyi533/tensorflow,tensorflow/tensorflow,xzturn/tensorflow,yongtang/tensorflow,karllessard/tensorflow,tensorflow/tensorflow-pywrap_saved_model,aam-at/tensorflow,karllessard/tensorflow,tensorflow/tensorflow-pywrap_saved_model,gautam1858/tensorflow,aldian/tensorflow,petewarden/tensorflow,aam-at/tensorflow,sarvex/tensorflow,Intel-Corporation/tensorflow,yongtang/tensorflow,paolodedios/tensorflow,petewarden/tensorflow,freedomtan/tensorflow,karllessard/tensorflow,xzturn/tensorflow,annarev/tensorflow,tensorflow/tensorflow,gunan/tensorflow,paolodedios/tensorflow,gunan/tensorflow,karllessard/tensorflow,freedomtan/tensorflow,freedomtan/tensorflow,xzturn/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,aldian/tensorflow,davidzchen/tensorflow,tensorflow/tensorflow-pywrap_saved_model,aam-at/tensorflow,gautam1858/tensorflow,aam-at/tensorflow,annarev/tensorflow,paolodedios/tensorflow