README: fix Docker Hub reference #144

Job	Run time
generate_matrix	11s
build_test_and_deploy (30, 30.0.3, --android-ndk, --gcloud)	14m 23s
build_test_and_deploy (30, 30.0.3, --android-ndk)	13m 18s
build_test_and_deploy (30, 30.0.3, --gcloud)	13m 47s
build_test_and_deploy (30, 30.0.3)	13m 19s
build_test_and_deploy (31, 30.0.3, build-tools 31 are corrupted. Use 30.0.3 instead, --android-nd...	14m 36s
build_test_and_deploy (31, 30.0.3, build-tools 31 are corrupted. Use 30.0.3 instead, --android-ndk)	14m 17s
build_test_and_deploy (31, 30.0.3, build-tools 31 are corrupted. Use 30.0.3 instead, --gcloud)	13m 2s
build_test_and_deploy (31, 30.0.3, build-tools 31 are corrupted. Use 30.0.3 instead)	13m 19s
build_test_and_deploy (32, 32.0.0, --android-ndk, --gcloud)	14m 52s
build_test_and_deploy (32, 32.0.0, --android-ndk)	13m 58s
build_test_and_deploy (32, 32.0.0, --gcloud)	13m 55s
build_test_and_deploy (32, 32.0.0)	12m 36s
build_test_and_deploy (33, 33.0.1, --android-ndk, --gcloud)	15m 39s
build_test_and_deploy (33, 33.0.1, --android-ndk)	14m 0s
build_test_and_deploy (33, 33.0.1, --gcloud)	12m 54s
build_test_and_deploy (33, 33.0.1)	12m 25s
build_test_and_deploy (34, 34.0.0, --android-ndk, --gcloud)	14m 41s
build_test_and_deploy (34, 34.0.0, --android-ndk)	14m 7s
build_test_and_deploy (34, 34.0.0, --gcloud)	13m 31s
build_test_and_deploy (34, 34.0.0)	12m 49s
	4h 35m 39s

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