Update example for 2.1.0.
Update example for 2.1.0.

gk5885/javawriter,kenzierocks/javapoet,ben-manes/javapoet,DirtyUnicorns/android_external_square_javawriter,leorric/javawriter,leorric/javawriter,kenzierocks/javapoet,rajatguptarg/javapoet,byterom/android_external_square_javawriter,PAC-ROM/android_external_square_javawriter,sitexa/javapoet,DirtyUnicorns/android_external_square_javawriter,mumer92/javapoet,square/javawriter,ponsonio/javapoet,studyfordream/javapoet,DanielSerdyukov/javapoet,sormuras/javapoet,ks94/javapoet,studyfordream/javapoet,ks94/javapoet,ThirdProject/android_external_square_javawriter,gk5885/javawriter,rajatguptarg/javapoet,auke-/javawriter,sitexa/javapoet,ben-manes/javapoet,DanielSerdyukov/javapoet,square/kotlinpoet,ponsonio/javapoet,eamonnmcmanus/javapoet,square/javapoet,sormuras/javapoet,ThirdProject/android_external_square_javawriter,APaloski/javapoet,APaloski/javapoet,eamonnmcmanus/javapoet,PAC-ROM/android_external_square_javawriter,mumer92/javapoet,byterom/android_external_square_javawriter,auke-/javawriter,square/kotlinpoet