Upgrade JDBI to 2.50.
Updated release notes

Should be largely complete, but a few smaller changes may have slipped
through the net.
Fixes #398: EOL in tests strings must match those in template files
Merge pull request #400 from kilemensi/issue-398

Fix tests for EOL in Freemarker template files in Windows

Fixes #398.
Merge remote-tracking branch 'upstream/master'