[jnigen] Publish 0.13.1 #539

Job	Run time
analyze_jni	1m 0s
analyze_jnigen (stable)	41s
build_jni_example_android	5m 14s
build_jni_example_linux	1m 9s
build_jni_example_windows	3m 37s
run_pdfbox_example_linux	2m 49s
test_jnigen_windows_minimal	9m 23s
test_jnigen_macos_minimal	3m 44s
test_jnigen (ubuntu-latest, stable)	8m 37s
test_jnigen (ubuntu-latest, beta)	9m 40s
test_jni	1m 53s
test_jni_macos_minimal	1m 31s
test_jni_windows_minimal	4m 34s
coveralls_finish	2m 25s
	56m 17s

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