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.

nemoRepoEmblems.py

@@ -37,7 +37,7 @@ from nemoRepoCore import (coreConfig, findRepoRoot, hasMarkerDirectory,
                           localDirectoryPath, pluginLogger, repoCache,
                           requireCore)
 
-requireCore("1.0.0")
+requireCore("0.1.0")
 
 logger = pluginLogger("emblems")