change version number (#2494)
change version number (#2494)

* change version number

* Clarify 0.60.0 release

* Delete stray line

* Touch up release notes

palantir/atlasdb,EvilMcJerkface/atlasdb,EvilMcJerkface/atlasdb,EvilMcJerkface/atlasdb,palantir/atlasdb,palantir/atlasdb