Document release process

[om26er]

The release process is simple, however it needs to be documented.

[tyler-32]

Hi @om26er -

Any chance you could publish a new release or document the process so others could do it?

The latest v21.7.1 release has several open security vulnerabilities (which appear to have been fixed in master already):

v21.7.1 CVE	v21.7.1 problem dependency	master version
CVE-2014-4043	org.web3j:core:4.6.0 > jnr-posix-3.0.47.jar autobahn-java/autobahn/build.gradle Line 34 in d9a591c implementation 'org.web3j:core:4.6.0'	YES? - org.web3j:core:4.11.0 > no more jnr-posix-3.0.47.jar autobahn-java/autobahn/build.gradle Line 35 in 5f13baa implementation 'org.web3j:core:4.11.0'
CVE-2020-28052	org.web3j:core:4.6.0 > org.java-websocket:Java-WebSocket:jar:1.3.8	YES? - org.web3j:core:4.11.0 > org.java-websocket:Java-WebSocket:jar:1.5.3

Glad to open a new issue if that's preferred (similar to #521).

Thank you & let me know if there's anything I can do to help with this!