Added Oxford comma in README.md
Added Oxford comma in README.md

Added an Oxford comma to line 28, to be consistent with the rest of the file.
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chinoy/tensorflow,paolodedios/tensorflow,karllessard/tensorflow,chemelnucfin/tensorflow,gautam1858/tensorflow,petewarden/tensorflow,tensorflow/tensorflow-pywrap_saved_model,sarvex/tensorflow,karllessard/tensorflow,karllessard/tensorflow,annarev/tensorflow,Intel-Corporation/tensorflow,ppwwyyxx/tensorflow,freedomtan/tensorflow,cxxgtxy/tensorflow,cxxgtxy/tensorflow,alsrgv/tensorflow,yongtang/tensorflow,annarev/tensorflow,jhseu/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,davidzchen/tensorflow,Intel-Corporation/tensorflow,frreiss/tensorflow-fred,yongtang/tensorflow,chemelnucfin/tensorflow,arborh/tensorflow,aldian/tensorflow,ppwwyyxx/tensorflow,xzturn/tensorflow,frreiss/tensorflow-fred,cxxgtxy/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,aam-at/tensorflow,annarev/tensorflow,ghchinoy/tensorflow,xzturn/tensorflow,freedomtan/tensorflow,sarvex/tensorflow,gautam1858/tensorflow,annarev/tensorflow,ppwwyyxx/tensorflow,adit-chandra/tensorflow,karllessard/tensorflow,karllessard/tensorflow,renyi533/tensorflow,alsrgv/tensorflow,tensorflow/tensorflow-pywrap_saved_model,gautam1858/tensorflow,gunan/tensorflow,alsrgv/tensorflow,ghchinoy/tensorflow,petewarden/tensorflow,ppwwyyxx/tensorflow,freedomtan/tensorflow,gunan/tensorflow,ppwwyyxx/tensorflow,freedomtan/tensorflow,tensorflow/tensorflow-pywrap_saved_model,aldian/tensorflow,xzturn/tensorflow,tensorflow/tensorflow-pywrap_saved_model,davidzchen/tensorflow,alsrgv/tensorflow,freedomtan/tensorflow,Intel-tensorflow/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,ghchinoy/tensorflow,renyi533/tensorflow,DavidNorman/tensorflow,xzturn/tensorflow,gautam1858/tensorflow,davidzchen/tensorflow,gautam1858/tensorflow,paolodedios/tensorflow,arborh/tensorflow,aam-at/tensorflow,renyi533/tensorflow,Intel-tensorflow/tensorflow,petewarden/tensorflow,sarvex/tensorflow,cxxgtxy/tensorflow,xzturn/tensorflow,Intel-tensorflow/tensorflow,davidzchen/tensorflow,davidzchen/tensorflow,xzturn/tensorflow,yongtang/tensorflow,sarvex/tensorflow,alsrgv/tensorflow,arborh/tensorflow,chemelnucfin/tensorflow,jhseu/tensorflow,aam-at/tensorflow,aam-at/tensorflow,jhseu/tensorflow,petewarden/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,DavidNorman/tensorflow,xzturn/tensorflow,adit-chandra/tensorflow,renyi533/tensorflow,Intel-tensorflow/tensorflow,Intel-tensorflow/tensorflow,karllessard/tensorflow,tensorflow/tensorflow,paolodedios/tensorflow,tensorflow/tensorflow-pywrap_saved_model,xzturn/tensorflow,chemelnucfin/tensorflow,paolodedios/tensorflow,Intel-Corporation/tensorflow,annarev/tensorflow,petewarden/tensorflow,ghchinoy/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,Intel-tensorflow/tensorflow,arborh/tensorflow,ppwwyyxx/tensorflow,aldian/tensorflow,karllessard/tensorflow,tensorflow/tensorflow,yongtang/tensorflow,Intel-tensorflow/tensorflow,annarev/tensorflow,freedomtan/tensorflow,tensorflow/tensorflow,freedomtan/tensorflow,chemelnucfin/tensorflow