prep 3.1.0

Signed-off-by: William Woodruff <william@trailofbits.com>

Author: woodruffw

CHANGELOG.md

@@ -8,6 +8,8 @@ All versions prior to 0.9.0 are untracked.
 
 ## [Unreleased]
 
+## [3.1.0]
+
 ### Added
 
 * API: `dsse.StatementBuilder` has been added. It can be used to construct an
@@ -459,7 +461,8 @@ This is a corrective release for [2.1.1].
 
 
 <!--Release URLs -->
-[Unreleased]: https://github.com/sigstore/sigstore-python/compare/v3.0.0...HEAD
+[Unreleased]: https://github.com/sigstore/sigstore-python/compare/v3.1.0...HEAD
+[3.1.0]: https://github.com/sigstore/sigstore-python/compare/v3.0.0...v3.1.0
 [3.0.0]: https://github.com/sigstore/sigstore-python/compare/v2.1.5...v3.0.0
 [2.1.5]: https://github.com/sigstore/sigstore-python/compare/v2.1.4...v2.1.5
 [2.1.4]: https://github.com/sigstore/sigstore-python/compare/v2.1.3...v2.1.4

sigstore/__init__.py

@@ -25,4 +25,4 @@
 * `sigstore.sign`: creation of Sigstore signatures
 """
 
-__version__ = "3.0.0"
+__version__ = "3.1.0"