Display pygit2 version in About dialog and --long-version

Author: zas

picard/util/versions.py

@@ -53,11 +53,21 @@
     'discid-version': "Discid",
     'astrcmp': "astrcmp",
     'ssl-version': "SSL",
+    'pygit2-version': "pygit2",
 }
 
 
 def _load_versions():
     global _versions
+
+    # Get pygit2 version if available
+    try:
+        import pygit2
+
+        pygit2_version = pygit2.__version__
+    except ImportError:
+        pygit2_version = None
+
     _versions = OrderedDict(
         (
             ('version', PICARD_FANCY_VERSION_STR),
@@ -68,6 +78,7 @@ def _load_versions():
             ('discid-version', discid_version),
             ('astrcmp', astrcmp_implementation),
             ('ssl-version', QSslSocket.sslLibraryVersionString()),
+            ('pygit2-version', pygit2_version),
         )
     )