Handle patch release versions.

Author: willson556

.gitignore

@@ -130,4 +130,7 @@ dmypy.json
 
 # example output
 example/*.csv
-settings.json
+settings.json
+
+# macOS files
+.DS_Store

staflversion/version.py

@@ -9,7 +9,7 @@
 @total_ordering
 class StaflVersion:
     VERSION_REGEX = re.compile(
-        r"^(?P<major>\d+)\.(?P<minor>\d+)\.(?P<patch>\d+)\+(?P<build>\d+)$"
+        r"^(?P<major>\d+)\.(?P<minor>\d+)\.(?P<patch>\d+)\+(?P<build>\d+)(-(?P<prerelease_metadata>.+))?$"
     )
 
     def __init__(self, major: int, minor: int, patch: int, build: int):

tests/test_version.py

@@ -132,3 +132,10 @@ def test_version_determine_set_version():
     )
     versioner = StaflVersioner(git)
     assert versioner.determine_version() == StaflVersion(1, 2, 3, 4)
+
+def test_version_patch_release():
+    git = MockGitWrapper(
+        ["Fix critical bug +semver:patch"], ["1.2.3+4-dev/patch", "1.2.2+0"]
+    )
+    versioner = StaflVersioner(git)
+    assert versioner.determine_version() == StaflVersion(1, 2, 4, 0)