message: Update Changelog with
diff: @@ -6,6 +6,7 @@ Tantivy 0.7
  - Tantivy error now rely on the failure crate (@drusellers)
  - Added support for `AND`, `OR`, `NOT` syntax in addition to the `+`,`-` syntax
  - Added a snippet generator with highlight (@vigneshsarma, @fulmicoton)
  +- Added a `TopFieldCollector` (@pentlander)
  Tantivy 0.6.1
  =========================
  