v0.3.20

What's Changed

• Adds an example demonstrating usage of log4j log filtering in a simpl… by @jkebinger in #114
• Move context merging upstream by @jkebinger in #115
• Bump version numbers to 0.3.20-pre1 by @jkebinger in #116
• Change version numbers to 0.3.20 by @jkebinger in #117

Full Changelog: v0.3.19...v0.3.20