Merge branch '1587-8-java9-module-info' into 'main'

Update module-info in jdk1.9 of pg package.

See merge request root/bc-java!59

Author: dghgit

pg/src/main/jdk1.9/module-info.java

@@ -12,6 +12,9 @@
     exports org.bouncycastle.gpg.keybox;
     exports org.bouncycastle.gpg.keybox.bc;
     exports org.bouncycastle.gpg.keybox.jcajce;
+    exports org.bouncycastle.openpgp.api;
+    exports org.bouncycastle.openpgp.api.bc;
+    exports org.bouncycastle.openpgp.api.jcajce;
     exports org.bouncycastle.openpgp.bc;
     exports org.bouncycastle.openpgp.examples;
     exports org.bouncycastle.openpgp.jcajce;