chore: pin the core requirement to 0.1.0

nemo-repo-core dropped from 1.0.0 to 0.1.0 while its API is still
unsettled, and requireCore treats the minor as the breaking component in
the 0.x range.

nemoRepoProperties.py

@@ -36,7 +36,7 @@ from gi.repository import GObject, Gtk, Nemo
 from nemoRepoCore import (findRepoRoot, repoCache, requireCore,
                           singleLocalDirectory)
 
-requireCore("1.0.0")
+requireCore("0.1.0")
 
 
 def _buildGrid():