Bump version for release.

NEWS

@@ -1,4 +1,4 @@
-1.9.8.dev0
+1.9.8
  * #979: Fix root patterns so they don't have an invalid "sh:" prefix before getting passed to Borg.
  * Expand the recent contributors documentation section to include ticket submitters—not just code
    contributors—because there are multiple ways to contribute to the project! See:

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "borgmatic"
-version = "1.9.8.dev0"
+version = "1.9.8"
 authors = [
   { name="Dan Helfman", email="witten@torsion.org" },
 ]