Add openjdk8 to the list of JDKs to build with (#33)
Add openjdk8 to the list of JDKs to build with (#33)

* Try OpenJDK 8 and 9 builds

* Remove undefined `openjdk9` from build matrix

msgilligan/bitcoinj-addons,msgilligan/bitcoinj-addons,msgilligan/bitcoinj-addons,msgilligan/bitcoinj-addons