fix missing angular plugin declaration at eslintrc
fix missing angular plugin declaration at eslintrc

dustinspecker/generator-ng-poly,dustinspecker/generator-ng-poly,Ins87/generator-ng-poly,ballerabdude/generator-ng-poly,egeland/generator-ng-poly,ballerabdude/generator-ng-poly,dustinspecker/generator-ng-poly,egeland/generator-ng-poly,TheOneTheOnlyDavidBrown/generator-ng-poly,egeland/generator-ng-poly,ballerabdude/generator-ng-poly,TheOneTheOnlyDavidBrown/generator-ng-poly,Ins87/generator-ng-poly,Ins87/generator-ng-poly,TheOneTheOnlyDavidBrown/generator-ng-poly